[llvm] b2cdd77 - [InstCombine] add tests for sign-bit-shift-of-sub; NFC
Sanjay Patel via llvm-commits
llvm-commits at lists.llvm.org
Tue Dec 1 05:08:24 PST 2020
Author: Sanjay Patel
Date: 2020-12-01T08:01:00-05:00
New Revision: b2cdd776e3e5a709d5904633956d3e9eaad78020
URL: https://github.com/llvm/llvm-project/commit/b2cdd776e3e5a709d5904633956d3e9eaad78020
DIFF: https://github.com/llvm/llvm-project/commit/b2cdd776e3e5a709d5904633956d3e9eaad78020.diff
LOG: [InstCombine] add tests for sign-bit-shift-of-sub; NFC
Added:
Modified:
llvm/test/Transforms/InstCombine/ashr-lshr.ll
llvm/test/Transforms/InstCombine/lshr.ll
Removed:
################################################################################
diff --git a/llvm/test/Transforms/InstCombine/ashr-lshr.ll b/llvm/test/Transforms/InstCombine/ashr-lshr.ll
index ee90dd5170c3..dc1deb043428 100644
--- a/llvm/test/Transforms/InstCombine/ashr-lshr.ll
+++ b/llvm/test/Transforms/InstCombine/ashr-lshr.ll
@@ -434,3 +434,139 @@ define <2 x i32> @ashr_lshr_inv_vec_wrong_pred(<2 x i32> %x, <2 x i32> %y) {
%ret = select <2 x i1> %cmp, <2 x i32> %r, <2 x i32> %l
ret <2 x i32> %ret
}
+
+define i32 @lshr_sub_nsw(i32 %x, i32 %y) {
+; CHECK-LABEL: @lshr_sub_nsw(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[SUB]], 31
+; CHECK-NEXT: ret i32 [[SHR]]
+;
+ %sub = sub nsw i32 %x, %y
+ %shr = lshr i32 %sub, 31
+ ret i32 %shr
+}
+
+define i32 @lshr_sub_wrong_amount(i32 %x, i32 %y) {
+; CHECK-LABEL: @lshr_sub_wrong_amount(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[SUB]], 30
+; CHECK-NEXT: ret i32 [[SHR]]
+;
+ %sub = sub nsw i32 %x, %y
+ %shr = lshr i32 %sub, 30
+ ret i32 %shr
+}
+
+define i32 @lshr_sub(i32 %x, i32 %y) {
+; CHECK-LABEL: @lshr_sub(
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[SUB]], 31
+; CHECK-NEXT: ret i32 [[SHR]]
+;
+ %sub = sub i32 %x, %y
+ %shr = lshr i32 %sub, 31
+ ret i32 %shr
+}
+
+define i32 @lshr_sub_nsw_extra_use(i32 %x, i32 %y, i32* %p) {
+; CHECK-LABEL: @lshr_sub_nsw_extra_use(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: store i32 [[SUB]], i32* [[P:%.*]], align 4
+; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[SUB]], 31
+; CHECK-NEXT: ret i32 [[SHR]]
+;
+ %sub = sub nsw i32 %x, %y
+ store i32 %sub, i32* %p
+ %shr = lshr i32 %sub, 31
+ ret i32 %shr
+}
+
+define <3 x i42> @lshr_sub_nsw_splat(<3 x i42> %x, <3 x i42> %y) {
+; CHECK-LABEL: @lshr_sub_nsw_splat(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw <3 x i42> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = lshr <3 x i42> [[SUB]], <i42 41, i42 41, i42 41>
+; CHECK-NEXT: ret <3 x i42> [[SHR]]
+;
+ %sub = sub nsw <3 x i42> %x, %y
+ %shr = lshr <3 x i42> %sub, <i42 41, i42 41, i42 41>
+ ret <3 x i42> %shr
+}
+
+define <3 x i42> @lshr_sub_nsw_splat_undef(<3 x i42> %x, <3 x i42> %y) {
+; CHECK-LABEL: @lshr_sub_nsw_splat_undef(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw <3 x i42> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = lshr <3 x i42> [[SUB]], <i42 41, i42 undef, i42 41>
+; CHECK-NEXT: ret <3 x i42> [[SHR]]
+;
+ %sub = sub nsw <3 x i42> %x, %y
+ %shr = lshr <3 x i42> %sub, <i42 41, i42 undef, i42 41>
+ ret <3 x i42> %shr
+}
+
+define i17 @ashr_sub_nsw(i17 %x, i17 %y) {
+; CHECK-LABEL: @ashr_sub_nsw(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw i17 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = ashr i17 [[SUB]], 16
+; CHECK-NEXT: ret i17 [[SHR]]
+;
+ %sub = sub nsw i17 %x, %y
+ %shr = ashr i17 %sub, 16
+ ret i17 %shr
+}
+
+define i17 @ashr_sub_wrong_amount(i17 %x, i17 %y) {
+; CHECK-LABEL: @ashr_sub_wrong_amount(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw i17 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = ashr i17 [[SUB]], 15
+; CHECK-NEXT: ret i17 [[SHR]]
+;
+ %sub = sub nsw i17 %x, %y
+ %shr = ashr i17 %sub, 15
+ ret i17 %shr
+}
+
+define i32 @ashr_sub(i32 %x, i32 %y) {
+; CHECK-LABEL: @ashr_sub(
+; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = ashr i32 [[SUB]], 31
+; CHECK-NEXT: ret i32 [[SHR]]
+;
+ %sub = sub i32 %x, %y
+ %shr = ashr i32 %sub, 31
+ ret i32 %shr
+}
+
+define i32 @ashr_sub_nsw_extra_use(i32 %x, i32 %y, i32* %p) {
+; CHECK-LABEL: @ashr_sub_nsw_extra_use(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: store i32 [[SUB]], i32* [[P:%.*]], align 4
+; CHECK-NEXT: [[SHR:%.*]] = ashr i32 [[SUB]], 31
+; CHECK-NEXT: ret i32 [[SHR]]
+;
+ %sub = sub nsw i32 %x, %y
+ store i32 %sub, i32* %p
+ %shr = ashr i32 %sub, 31
+ ret i32 %shr
+}
+
+define <3 x i43> @ashr_sub_nsw_splat(<3 x i43> %x, <3 x i43> %y) {
+; CHECK-LABEL: @ashr_sub_nsw_splat(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw <3 x i43> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = ashr <3 x i43> [[SUB]], <i43 42, i43 42, i43 42>
+; CHECK-NEXT: ret <3 x i43> [[SHR]]
+;
+ %sub = sub nsw <3 x i43> %x, %y
+ %shr = ashr <3 x i43> %sub, <i43 42, i43 42, i43 42>
+ ret <3 x i43> %shr
+}
+
+define <3 x i43> @ashr_sub_nsw_splat_undef(<3 x i43> %x, <3 x i43> %y) {
+; CHECK-LABEL: @ashr_sub_nsw_splat_undef(
+; CHECK-NEXT: [[SUB:%.*]] = sub nsw <3 x i43> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[SHR:%.*]] = ashr <3 x i43> [[SUB]], <i43 42, i43 undef, i43 42>
+; CHECK-NEXT: ret <3 x i43> [[SHR]]
+;
+ %sub = sub nsw <3 x i43> %x, %y
+ %shr = ashr <3 x i43> %sub, <i43 42, i43 undef, i43 42>
+ ret <3 x i43> %shr
+}
diff --git a/llvm/test/Transforms/InstCombine/lshr.ll b/llvm/test/Transforms/InstCombine/lshr.ll
index 429a826c7981..bcc980da190f 100644
--- a/llvm/test/Transforms/InstCombine/lshr.ll
+++ b/llvm/test/Transforms/InstCombine/lshr.ll
@@ -259,4 +259,3 @@ define <2 x i32> @narrow_lshr_constant(<2 x i8> %x, <2 x i8> %y) {
%sh = lshr <2 x i32> %zx, <i32 3, i32 3>
ret <2 x i32> %sh
}
-
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