forked from OSchip/llvm-project
240 lines
7.7 KiB
LLVM
240 lines
7.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine %s -S -o - | FileCheck %s
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; Clamp positive to allOnes:
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; E.g., clamp255 implemented in a shifty way, could be optimized as v > 255 ? 255 : v, where sub hasNoSignedWrap.
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; int32 clamp255(int32 v) {
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; return (((255 - (v)) >> 31) | (v)) & 255;
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; }
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;
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; Scalar Types
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define i32 @clamp255_i32(i32 %x) {
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; CHECK-LABEL: @clamp255_i32(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i32 [[X:%.*]], 255
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i32 [[X]], i32 255
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[OR]], 255
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; CHECK-NEXT: ret i32 [[AND]]
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;
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%sub = sub nsw i32 255, %x
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%shr = ashr i32 %sub, 31
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%or = or i32 %shr, %x
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%and = and i32 %or, 255
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ret i32 %and
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}
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define i8 @sub_ashr_or_i8(i8 %x, i8 %y) {
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; CHECK-LABEL: @sub_ashr_or_i8(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i8 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i8 -1, i8 [[X]]
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; CHECK-NEXT: ret i8 [[OR]]
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;
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%sub = sub nsw i8 %y, %x
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%shr = ashr i8 %sub, 7
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%or = or i8 %shr, %x
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ret i8 %or
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}
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define i16 @sub_ashr_or_i16(i16 %x, i16 %y) {
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; CHECK-LABEL: @sub_ashr_or_i16(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i16 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i16 -1, i16 [[X]]
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; CHECK-NEXT: ret i16 [[OR]]
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;
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%sub = sub nsw i16 %y, %x
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%shr = ashr i16 %sub, 15
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%or = or i16 %shr, %x
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ret i16 %or
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}
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define i32 @sub_ashr_or_i32(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_ashr_or_i32(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i32 -1, i32 [[X]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%sub = sub nsw i32 %y, %x
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%shr = ashr i32 %sub, 31
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%or = or i32 %shr, %x
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ret i32 %or
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}
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define i64 @sub_ashr_or_i64(i64 %x, i64 %y) {
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; CHECK-LABEL: @sub_ashr_or_i64(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i64 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i64 -1, i64 [[X]]
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; CHECK-NEXT: ret i64 [[OR]]
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;
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%sub = sub nsw i64 %y, %x
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%shr = ashr i64 %sub, 63
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%or = or i64 %shr, %x
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ret i64 %or
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}
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; nuw nsw
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define i32 @sub_ashr_or_i32_nuw_nsw(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_ashr_or_i32_nuw_nsw(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i32 -1, i32 [[X]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%sub = sub nuw nsw i32 %y, %x
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%shr = ashr i32 %sub, 31
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%or = or i32 %shr, %x
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ret i32 %or
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}
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; Commute
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define i32 @sub_ashr_or_i32_commute(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_ashr_or_i32_commute(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i32 -1, i32 [[X]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%sub = sub nsw i32 %y, %x
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%shr = ashr i32 %sub, 31
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%or = or i32 %x, %shr ; commute %shr and %x
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ret i32 %or
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}
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; Vector Types
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define <4 x i32> @sub_ashr_or_i32_vec(<4 x i32> %x, <4 x i32> %y) {
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; CHECK-LABEL: @sub_ashr_or_i32_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt <4 x i32> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select <4 x i1> [[TMP1]], <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> [[X]]
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; CHECK-NEXT: ret <4 x i32> [[OR]]
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;
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%sub = sub nsw <4 x i32> %y, %x
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%shr = ashr <4 x i32> %sub, <i32 31, i32 31, i32 31, i32 31>
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%or = or <4 x i32> %shr, %x
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ret <4 x i32> %or
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}
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define <4 x i32> @sub_ashr_or_i32_vec_nuw_nsw(<4 x i32> %x, <4 x i32> %y) {
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; CHECK-LABEL: @sub_ashr_or_i32_vec_nuw_nsw(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt <4 x i32> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select <4 x i1> [[TMP1]], <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> [[X]]
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; CHECK-NEXT: ret <4 x i32> [[OR]]
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;
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%sub = sub nuw nsw <4 x i32> %y, %x
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%shr = ashr <4 x i32> %sub, <i32 31, i32 31, i32 31, i32 31>
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%or = or <4 x i32> %shr, %x
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ret <4 x i32> %or
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}
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define <4 x i32> @sub_ashr_or_i32_vec_commute(<4 x i32> %x, <4 x i32> %y) {
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; CHECK-LABEL: @sub_ashr_or_i32_vec_commute(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt <4 x i32> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select <4 x i1> [[TMP1]], <4 x i32> <i32 -1, i32 -1, i32 -1, i32 -1>, <4 x i32> [[X]]
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; CHECK-NEXT: ret <4 x i32> [[OR]]
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;
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%sub = sub nsw <4 x i32> %y, %x
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%shr = ashr <4 x i32> %sub, <i32 31, i32 31, i32 31, i32 31>
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%or = or <4 x i32> %x, %shr
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ret <4 x i32> %or
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}
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; Extra uses
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define i32 @sub_ashr_or_i32_extra_use_sub(i32 %x, i32 %y, i32* %p) {
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; CHECK-LABEL: @sub_ashr_or_i32_extra_use_sub(
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; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: store i32 [[SUB]], i32* [[P:%.*]], align 4
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; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i32 [[Y]], [[X]]
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i32 -1, i32 [[X]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%sub = sub nsw i32 %y, %x
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store i32 %sub, i32* %p
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%shr = ashr i32 %sub, 31
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%or = or i32 %shr, %x
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ret i32 %or
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}
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define i32 @sub_ashr_or_i32_extra_use_or(i32 %x, i32 %y, i32* %p) {
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; CHECK-LABEL: @sub_ashr_or_i32_extra_use_or(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp sgt i32 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[OR:%.*]] = select i1 [[TMP1]], i32 -1, i32 [[X]]
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; CHECK-NEXT: store i32 [[OR]], i32* [[P:%.*]], align 4
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%sub = sub nsw i32 %y, %x
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%shr = ashr i32 %sub, 31
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%or = or i32 %shr, %x
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store i32 %or, i32* %p
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ret i32 %or
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}
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; Negative Tests
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define i32 @sub_ashr_or_i32_extra_use_ashr(i32 %x, i32 %y, i32* %p) {
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; CHECK-LABEL: @sub_ashr_or_i32_extra_use_ashr(
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; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: [[SHR:%.*]] = ashr i32 [[SUB]], 31
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; CHECK-NEXT: store i32 [[SHR]], i32* [[P:%.*]], align 4
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[SHR]], [[X]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%sub = sub nsw i32 %y, %x
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%shr = ashr i32 %sub, 31
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store i32 %shr, i32* %p
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%or = or i32 %shr, %x
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ret i32 %or
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}
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define i32 @sub_ashr_or_i32_no_nsw_nuw(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_ashr_or_i32_no_nsw_nuw(
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; CHECK-NEXT: [[SUB:%.*]] = sub i32 [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: [[SHR:%.*]] = ashr i32 [[SUB]], 31
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[SHR]], [[X]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%sub = sub i32 %y, %x
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%shr = ashr i32 %sub, 31
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%or = or i32 %shr, %x
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ret i32 %or
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}
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define <4 x i32> @sub_ashr_or_i32_vec_undef1(<4 x i32> %x) {
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; CHECK-LABEL: @sub_ashr_or_i32_vec_undef1(
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; CHECK-NEXT: [[SUB:%.*]] = sub <4 x i32> <i32 255, i32 255, i32 undef, i32 255>, [[X:%.*]]
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; CHECK-NEXT: [[SHR:%.*]] = ashr <4 x i32> [[SUB]], <i32 31, i32 31, i32 31, i32 31>
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; CHECK-NEXT: [[OR:%.*]] = or <4 x i32> [[SHR]], [[X]]
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; CHECK-NEXT: ret <4 x i32> [[OR]]
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;
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%sub = sub <4 x i32> <i32 255, i32 255, i32 undef, i32 255>, %x
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%shr = ashr <4 x i32> %sub, <i32 31, i32 31, i32 31, i32 31>
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%or = or <4 x i32> %shr, %x
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ret <4 x i32> %or
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}
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define <4 x i32> @sub_ashr_or_i32_vec_undef2(<4 x i32> %x) {
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; CHECK-LABEL: @sub_ashr_or_i32_vec_undef2(
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; CHECK-NEXT: [[SUB:%.*]] = sub nsw <4 x i32> <i32 255, i32 255, i32 255, i32 255>, [[X:%.*]]
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; CHECK-NEXT: [[SHR:%.*]] = ashr <4 x i32> [[SUB]], <i32 undef, i32 31, i32 31, i32 31>
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; CHECK-NEXT: [[OR:%.*]] = or <4 x i32> [[SHR]], [[X]]
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; CHECK-NEXT: ret <4 x i32> [[OR]]
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;
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%sub = sub nsw <4 x i32> <i32 255, i32 255, i32 255, i32 255>, %x
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%shr = ashr <4 x i32> %sub, <i32 undef, i32 31, i32 31, i32 31>
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%or = or <4 x i32> %shr, %x
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ret <4 x i32> %or
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}
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define i32 @sub_ashr_or_i32_shift_wrong_bit(i32 %x, i32 %y) {
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; CHECK-LABEL: @sub_ashr_or_i32_shift_wrong_bit(
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; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: [[SHR:%.*]] = ashr i32 [[SUB]], 11
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[SHR]], [[X]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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%sub = sub nsw i32 %y, %x
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%shr = ashr i32 %sub, 11
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%or = or i32 %shr, %x
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ret i32 %or
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}
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