[llvm] r373541 - [NFC][InstCombine] Add tests for 'variable sext of variable high bit extract' pattern (PR43523)
Roman Lebedev via llvm-commits
llvm-commits at lists.llvm.org
Wed Oct 2 16:01:59 PDT 2019
Author: lebedevri
Date: Wed Oct 2 16:01:58 2019
New Revision: 373541
URL: http://llvm.org/viewvc/llvm-project?rev=373541&view=rev
Log:
[NFC][InstCombine] Add tests for 'variable sext of variable high bit extract' pattern (PR43523)
https://bugs.llvm.org/show_bug.cgi?id=43523
Added:
llvm/trunk/test/Transforms/InstCombine/variable-signext-of-variable-high-bit-extraction.ll
Added: llvm/trunk/test/Transforms/InstCombine/variable-signext-of-variable-high-bit-extraction.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/variable-signext-of-variable-high-bit-extraction.ll?rev=373541&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/variable-signext-of-variable-high-bit-extraction.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/variable-signext-of-variable-high-bit-extraction.ll Wed Oct 2 16:01:58 2019
@@ -0,0 +1,584 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt %s -instcombine -S | FileCheck %s
+
+declare void @use16(i16)
+declare void @use32(i32)
+declare void @use64(i64)
+
+define i32 @t0(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @t0(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret i32 %signextended
+}
+define i32 @t0_zext_of_nbits(i64 %data, i8 %nbits_narrow) {
+; CHECK-LABEL: @t0_zext_of_nbits(
+; CHECK-NEXT: [[NBITS:%.*]] = zext i8 [[NBITS_NARROW:%.*]] to i16
+; CHECK-NEXT: call void @use16(i16 [[NBITS]])
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub nsw i16 64, [[NBITS]]
+; CHECK-NEXT: call void @use16(i16 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i16 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW_NARROW:%.*]] = sub nsw i16 32, [[NBITS]]
+; CHECK-NEXT: call void @use16(i16 [[NUM_HIGH_BITS_TO_SMEAR_NARROW_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = zext i16 [[NUM_HIGH_BITS_TO_SMEAR_NARROW_NARROW]] to i32
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %nbits = zext i8 %nbits_narrow to i16
+ call void @use16(i16 %nbits)
+ %skip_high = sub i16 64, %nbits
+ call void @use16(i16 %skip_high)
+ %skip_high_wide = zext i16 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow_narrow = sub i16 32, %nbits
+ call void @use16(i16 %num_high_bits_to_smear_narrow_narrow)
+ %num_high_bits_to_smear_narrow = zext i16 %num_high_bits_to_smear_narrow_narrow to i32
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret i32 %signextended
+}
+define i32 @t0_exact(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @t0_exact(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr exact i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr exact i64 %data, %skip_high_wide ; We can preserve `exact`-ness of the original shift.
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret i32 %signextended
+}
+
+define i32 @t1_redundant_sext(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @t1_redundant_sext(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED_WITH_SIGNEXTENSION:%.*]] = ashr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED_WITH_SIGNEXTENSION]])
+; CHECK-NEXT: [[EXTRACTED_WITH_SIGNEXTENSION_NARROW:%.*]] = trunc i64 [[EXTRACTED_WITH_SIGNEXTENSION]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_WITH_SIGNEXTENSION_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_WITH_SIGNEXTENSION_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: call void @use32(i32 [[SIGNBIT_POSITIONED]])
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted_with_signextension = ashr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted_with_signextension)
+ %extracted_with_signextension_narrow = trunc i64 %extracted_with_signextension to i32 ; this is already the answer.
+ call void @use32(i32 %extracted_with_signextension_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_with_signextension_narrow, %num_high_bits_to_smear_narrow
+ call void @use32(i32 %signbit_positioned)
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret i32 %signextended
+}
+
+define i64 @t2_notrunc(i64 %data, i64 %nbits) {
+; CHECK-LABEL: @t2_notrunc(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i64 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR:%.*]] = sub i64 64, [[NBITS]]
+; CHECK-NEXT: call void @use64(i64 [[NUM_HIGH_BITS_TO_SMEAR]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i64 [[EXTRACTED]], [[NUM_HIGH_BITS_TO_SMEAR]]
+; CHECK-NEXT: call void @use64(i64 [[SIGNBIT_POSITIONED]])
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i64 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR]]
+; CHECK-NEXT: ret i64 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i64 64, %nbits
+ call void @use64(i64 %skip_high)
+ %extracted = lshr i64 %data, %skip_high
+ call void @use64(i64 %extracted)
+ %num_high_bits_to_smear = sub i64 64, %nbits
+ call void @use64(i64 %num_high_bits_to_smear)
+ %signbit_positioned = shl i64 %extracted, %num_high_bits_to_smear ;
+ call void @use64(i64 %signbit_positioned)
+ %signextended = ashr i64 %signbit_positioned, %num_high_bits_to_smear ; can just shift %data itself.
+ ret i64 %signextended
+}
+
+define i64 @t3_notrunc_redundant_sext(i64 %data, i64 %nbits) {
+; CHECK-LABEL: @t3_notrunc_redundant_sext(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i64 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = ashr i64 [[DATA:%.*]], [[SKIP_HIGH]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR:%.*]] = sub i64 64, [[NBITS]]
+; CHECK-NEXT: call void @use64(i64 [[NUM_HIGH_BITS_TO_SMEAR]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i64 [[EXTRACTED]], [[NUM_HIGH_BITS_TO_SMEAR]]
+; CHECK-NEXT: call void @use64(i64 [[SIGNBIT_POSITIONED]])
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i64 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR]]
+; CHECK-NEXT: ret i64 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i64 64, %nbits
+ call void @use64(i64 %skip_high)
+ %extracted = ashr i64 %data, %skip_high ; this is already the answer.
+ call void @use64(i64 %extracted)
+ %num_high_bits_to_smear = sub i64 64, %nbits
+ call void @use64(i64 %num_high_bits_to_smear)
+ %signbit_positioned = shl i64 %extracted, %num_high_bits_to_smear
+ call void @use64(i64 %signbit_positioned)
+ %signextended = ashr i64 %signbit_positioned, %num_high_bits_to_smear
+ ret i64 %signextended
+}
+
+define <2 x i32> @t4_vec(<2 x i64> %data, <2 x i32> %nbits) {
+; CHECK-LABEL: @t4_vec(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub <2 x i32> <i32 64, i32 64>, [[NBITS:%.*]]
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext <2 x i32> [[SKIP_HIGH]] to <2 x i64>
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr <2 x i64> [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc <2 x i64> [[EXTRACTED]] to <2 x i32>
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub <2 x i32> <i32 32, i32 32>, [[NBITS]]
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl <2 x i32> [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr <2 x i32> [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret <2 x i32> [[SIGNEXTENDED]]
+;
+ %skip_high = sub <2 x i32> <i32 64, i32 64>, %nbits
+ %skip_high_wide = zext <2 x i32> %skip_high to <2 x i64>
+ %extracted = lshr <2 x i64> %data, %skip_high_wide
+ %extracted_narrow = trunc <2 x i64> %extracted to <2 x i32>
+ %num_high_bits_to_smear_narrow = sub <2 x i32> <i32 32, i32 32>, %nbits
+ %signbit_positioned = shl <2 x i32> %extracted_narrow, %num_high_bits_to_smear_narrow
+ %signextended = ashr <2 x i32> %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret <2 x i32> %signextended
+}
+
+define <3 x i32> @t5_vec_undef(<3 x i64> %data, <3 x i32> %nbits) {
+; CHECK-LABEL: @t5_vec_undef(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub <3 x i32> <i32 64, i32 64, i32 undef>, [[NBITS:%.*]]
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext <3 x i32> [[SKIP_HIGH]] to <3 x i64>
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr <3 x i64> [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc <3 x i64> [[EXTRACTED]] to <3 x i32>
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW0:%.*]] = sub <3 x i32> <i32 32, i32 32, i32 undef>, [[NBITS]]
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW1:%.*]] = sub <3 x i32> <i32 undef, i32 32, i32 32>, [[NBITS]]
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl <3 x i32> [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW0]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr <3 x i32> [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW1]]
+; CHECK-NEXT: ret <3 x i32> [[SIGNEXTENDED]]
+;
+ %skip_high = sub <3 x i32> <i32 64, i32 64, i32 undef>, %nbits
+ %skip_high_wide = zext <3 x i32> %skip_high to <3 x i64>
+ %extracted = lshr <3 x i64> %data, %skip_high_wide
+ %extracted_narrow = trunc <3 x i64> %extracted to <3 x i32>
+ %num_high_bits_to_smear_narrow0 = sub <3 x i32> <i32 32, i32 32, i32 undef>, %nbits
+ %num_high_bits_to_smear_narrow1 = sub <3 x i32> <i32 undef, i32 32, i32 32>, %nbits
+ %signbit_positioned = shl <3 x i32> %extracted_narrow, %num_high_bits_to_smear_narrow0
+ %signextended = ashr <3 x i32> %signbit_positioned, %num_high_bits_to_smear_narrow1
+ ret <3 x i32> %signextended
+}
+
+; Extra-uses
+define i32 @t6_extrause_good0(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @t6_extrause_good0(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow ; will go away
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret i32 %signextended
+}
+define i32 @t7_extrause_good1(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @t7_extrause_good1(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW0:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW0]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW1:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW0]]
+; CHECK-NEXT: call void @use32(i32 [[SIGNBIT_POSITIONED]])
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW1]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow0 = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow0)
+ %num_high_bits_to_smear_narrow1 = sub i32 32, %nbits ; will go away.
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow0
+ call void @use32(i32 %signbit_positioned)
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow1
+ ret i32 %signextended
+}
+define i32 @n8_extrause_bad(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @n8_extrause_bad(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: call void @use32(i32 [[SIGNBIT_POSITIONED]])
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ call void @use32(i32 %signbit_positioned)
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow ; neither of operands will go away.
+ ret i32 %signextended
+}
+
+; Negative tests
+define i32 @n9(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @n9(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 63, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 63, %nbits ; not 64
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret i32 %signextended
+}
+
+define i32 @n10(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @n10(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 31, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 31, %nbits ; not 32
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret i32 %signextended
+}
+
+define i32 @n11(i64 %data, i32 %nbits1, i32 %nbits2) {
+; CHECK-LABEL: @n11(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS1:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS2:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits1 ; not %nbits2
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits2 ; not %nbits1
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow
+ ret i32 %signextended
+}
+
+define i32 @n12(i64 %data, i32 %nbits1, i32 %nbits2) {
+; CHECK-LABEL: @n12(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS1:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW1:%.*]] = sub i32 32, [[NBITS1]]
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW2:%.*]] = sub i32 32, [[NBITS2:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW1]])
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW2]])
+; CHECK-NEXT: [[SIGNBIT_POSITIONED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW1]]
+; CHECK-NEXT: [[SIGNEXTENDED:%.*]] = ashr i32 [[SIGNBIT_POSITIONED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW2]]
+; CHECK-NEXT: ret i32 [[SIGNEXTENDED]]
+;
+ %skip_high = sub i32 64, %nbits1
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow1 = sub i32 32, %nbits1 ; not %nbits2
+ %num_high_bits_to_smear_narrow2 = sub i32 32, %nbits2 ; not %nbits1
+ call void @use32(i32 %num_high_bits_to_smear_narrow1)
+ call void @use32(i32 %num_high_bits_to_smear_narrow2)
+ %signbit_positioned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow1
+ %signextended = ashr i32 %signbit_positioned, %num_high_bits_to_smear_narrow2
+ ret i32 %signextended
+}
+
+define i32 @n13(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @n13(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[TMP1:%.*]] = lshr i32 -1, [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[RES:%.*]] = and i32 [[TMP1]], [[EXTRACTED_NARROW]]
+; CHECK-NEXT: ret i32 [[RES]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %highbits_cleaned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ %res = lshr i32 %highbits_cleaned, %num_high_bits_to_smear_narrow ; not ashr
+ ret i32 %res
+}
+define i32 @n13_extrause(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @n13_extrause(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[HIGHBITS_CLEANED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: call void @use32(i32 [[HIGHBITS_CLEANED]])
+; CHECK-NEXT: [[RES:%.*]] = lshr i32 [[HIGHBITS_CLEANED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[RES]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = lshr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %highbits_cleaned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ call void @use32(i32 %highbits_cleaned)
+ %res = lshr i32 %highbits_cleaned, %num_high_bits_to_smear_narrow ; not ashr
+ ret i32 %res
+}
+define i32 @n14(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @n14(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = ashr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[TMP1:%.*]] = lshr i32 -1, [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: [[RES:%.*]] = and i32 [[TMP1]], [[EXTRACTED_NARROW]]
+; CHECK-NEXT: ret i32 [[RES]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = ashr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %highbits_cleaned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ %res = lshr i32 %highbits_cleaned, %num_high_bits_to_smear_narrow ; not ashr
+ ret i32 %res
+}
+define i32 @n14_extrause(i64 %data, i32 %nbits) {
+; CHECK-LABEL: @n14_extrause(
+; CHECK-NEXT: [[SKIP_HIGH:%.*]] = sub i32 64, [[NBITS:%.*]]
+; CHECK-NEXT: call void @use32(i32 [[SKIP_HIGH]])
+; CHECK-NEXT: [[SKIP_HIGH_WIDE:%.*]] = zext i32 [[SKIP_HIGH]] to i64
+; CHECK-NEXT: call void @use64(i64 [[SKIP_HIGH_WIDE]])
+; CHECK-NEXT: [[EXTRACTED:%.*]] = ashr i64 [[DATA:%.*]], [[SKIP_HIGH_WIDE]]
+; CHECK-NEXT: call void @use64(i64 [[EXTRACTED]])
+; CHECK-NEXT: [[EXTRACTED_NARROW:%.*]] = trunc i64 [[EXTRACTED]] to i32
+; CHECK-NEXT: call void @use32(i32 [[EXTRACTED_NARROW]])
+; CHECK-NEXT: [[NUM_HIGH_BITS_TO_SMEAR_NARROW:%.*]] = sub i32 32, [[NBITS]]
+; CHECK-NEXT: call void @use32(i32 [[NUM_HIGH_BITS_TO_SMEAR_NARROW]])
+; CHECK-NEXT: [[HIGHBITS_CLEANED:%.*]] = shl i32 [[EXTRACTED_NARROW]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: call void @use32(i32 [[HIGHBITS_CLEANED]])
+; CHECK-NEXT: [[RES:%.*]] = lshr i32 [[HIGHBITS_CLEANED]], [[NUM_HIGH_BITS_TO_SMEAR_NARROW]]
+; CHECK-NEXT: ret i32 [[RES]]
+;
+ %skip_high = sub i32 64, %nbits
+ call void @use32(i32 %skip_high)
+ %skip_high_wide = zext i32 %skip_high to i64
+ call void @use64(i64 %skip_high_wide)
+ %extracted = ashr i64 %data, %skip_high_wide
+ call void @use64(i64 %extracted)
+ %extracted_narrow = trunc i64 %extracted to i32
+ call void @use32(i32 %extracted_narrow)
+ %num_high_bits_to_smear_narrow = sub i32 32, %nbits
+ call void @use32(i32 %num_high_bits_to_smear_narrow)
+ %highbits_cleaned = shl i32 %extracted_narrow, %num_high_bits_to_smear_narrow
+ call void @use32(i32 %highbits_cleaned)
+ %res = lshr i32 %highbits_cleaned, %num_high_bits_to_smear_narrow ; not ashr
+ ret i32 %res
+}
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