[llvm] r364657 - [NFC][InstCombine] Shift amount reassociation: revisit flag preservation tests
Roman Lebedev via llvm-commits
llvm-commits at lists.llvm.org
Fri Jun 28 09:36:53 PDT 2019
Author: lebedevri
Date: Fri Jun 28 09:36:53 2019
New Revision: 364657
URL: http://llvm.org/viewvc/llvm-project?rev=364657&view=rev
Log:
[NFC][InstCombine] Shift amount reassociation: revisit flag preservation tests
Modified:
llvm/trunk/test/Transforms/InstCombine/shift-amount-reassociation.ll
Modified: llvm/trunk/test/Transforms/InstCombine/shift-amount-reassociation.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/shift-amount-reassociation.ll?rev=364657&r1=364656&r2=364657&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/shift-amount-reassociation.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/shift-amount-reassociation.ll Fri Jun 28 09:36:53 2019
@@ -108,13 +108,13 @@ define i32 @t6_shl(i32 %x, i32 %y) {
; CHECK-NEXT: [[T0:%.*]] = sub i32 32, [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = shl nuw i32 [[X:%.*]], [[T0]]
; CHECK-NEXT: [[T2:%.*]] = add i32 [[Y]], -2
-; CHECK-NEXT: [[T3:%.*]] = shl i32 [[T1]], [[T2]]
+; CHECK-NEXT: [[T3:%.*]] = shl nsw i32 [[T1]], [[T2]]
; CHECK-NEXT: ret i32 [[T3]]
;
%t0 = sub i32 32, %y
%t1 = shl nuw i32 %x, %t0 ; while there, test that we don't propagate partial 'nuw' flag
%t2 = add i32 %y, -2
- %t3 = shl i32 %t1, %t2
+ %t3 = shl nsw i32 %t1, %t2 ; while there, test that we don't propagate partial 'nsw' flag
ret i32 %t3
}
define i32 @t7_ashr(i32 %x, i32 %y) {
@@ -133,8 +133,8 @@ define i32 @t7_ashr(i32 %x, i32 %y) {
}
; If the same flag is present on both shifts, it can be kept.
-define i32 @t8_lshr_flag_preservation(i32 %x, i32 %y) {
-; CHECK-LABEL: @t8_lshr_flag_preservation(
+define i32 @t8_lshr_exact_flag_preservation(i32 %x, i32 %y) {
+; CHECK-LABEL: @t8_lshr_exact_flag_preservation(
; CHECK-NEXT: [[T0:%.*]] = sub i32 32, [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = lshr exact i32 [[X:%.*]], [[T0]]
; CHECK-NEXT: [[T2:%.*]] = add i32 [[Y]], -2
@@ -147,8 +147,8 @@ define i32 @t8_lshr_flag_preservation(i3
%t3 = lshr exact i32 %t1, %t2
ret i32 %t3
}
-define i32 @t9_ashr_flag_preservation(i32 %x, i32 %y) {
-; CHECK-LABEL: @t9_ashr_flag_preservation(
+define i32 @t9_ashr_exact_flag_preservation(i32 %x, i32 %y) {
+; CHECK-LABEL: @t9_ashr_exact_flag_preservation(
; CHECK-NEXT: [[T0:%.*]] = sub i32 32, [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = ashr exact i32 [[X:%.*]], [[T0]]
; CHECK-NEXT: [[T2:%.*]] = add i32 [[Y]], -2
@@ -161,8 +161,8 @@ define i32 @t9_ashr_flag_preservation(i3
%t3 = ashr exact i32 %t1, %t2
ret i32 %t3
}
-define i32 @t10_shl_flag_preservation(i32 %x, i32 %y) {
-; CHECK-LABEL: @t10_shl_flag_preservation(
+define i32 @t10_shl_nuw_flag_preservation(i32 %x, i32 %y) {
+; CHECK-LABEL: @t10_shl_nuw_flag_preservation(
; CHECK-NEXT: [[T0:%.*]] = sub i32 32, [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = shl nuw i32 [[X:%.*]], [[T0]]
; CHECK-NEXT: [[T2:%.*]] = add i32 [[Y]], -2
@@ -175,14 +175,28 @@ define i32 @t10_shl_flag_preservation(i3
%t3 = shl nuw nsw i32 %t1, %t2 ; only 'nuw' should be propagated.
ret i32 %t3
}
+define i32 @t11_shl_nsw_flag_preservation(i32 %x, i32 %y) {
+; CHECK-LABEL: @t11_shl_nsw_flag_preservation(
+; CHECK-NEXT: [[T0:%.*]] = sub i32 32, [[Y:%.*]]
+; CHECK-NEXT: [[T1:%.*]] = shl nsw i32 [[X:%.*]], [[T0]]
+; CHECK-NEXT: [[T2:%.*]] = add i32 [[Y]], -2
+; CHECK-NEXT: [[T3:%.*]] = shl nuw nsw i32 [[T1]], [[T2]]
+; CHECK-NEXT: ret i32 [[T3]]
+;
+ %t0 = sub i32 32, %y
+ %t1 = shl nsw i32 %x, %t0
+ %t2 = add i32 %y, -2
+ %t3 = shl nsw nuw i32 %t1, %t2 ; only 'nuw' should be propagated.
+ ret i32 %t3
+}
; No one-use tests since we will only produce a single instruction here.
; Negative tests
; Can't fold, total shift would be 32
-define i32 @n11(i32 %x, i32 %y) {
-; CHECK-LABEL: @n11(
+define i32 @n12(i32 %x, i32 %y) {
+; CHECK-LABEL: @n12(
; CHECK-NEXT: [[T0:%.*]] = sub i32 30, [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = lshr i32 [[X:%.*]], [[T0]]
; CHECK-NEXT: [[T2:%.*]] = add i32 [[Y]], 2
@@ -196,8 +210,8 @@ define i32 @n11(i32 %x, i32 %y) {
ret i32 %t3
}
; Can't fold, for second channel the shift would 32
-define <2 x i32> @t12_vec(<2 x i32> %x, <2 x i32> %y) {
-; CHECK-LABEL: @t12_vec(
+define <2 x i32> @t13_vec(<2 x i32> %x, <2 x i32> %y) {
+; CHECK-LABEL: @t13_vec(
; CHECK-NEXT: [[T0:%.*]] = sub <2 x i32> <i32 32, i32 30>, [[Y:%.*]]
; CHECK-NEXT: [[T1:%.*]] = lshr <2 x i32> [[X:%.*]], [[T0]]
; CHECK-NEXT: [[T2:%.*]] = add <2 x i32> [[Y]], <i32 -2, i32 2>
More information about the llvm-commits
mailing list