7b07c01351
Add lshr (sext i1 X to iN), C --> select (X, -1 >> C, 0) case. This expands C == N-1 case to arbitrary C. Fixes PR52078. Reviewed By: spatel, RKSimon, lebedev.ri Differential Revision: https://reviews.llvm.org/D111330
46 lines
1.4 KiB
LLVM
46 lines
1.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -O2 -S < %s | FileCheck %s
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; RUN: opt -instcombine -S < %s | FileCheck %s --check-prefix=IC
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; RUN: opt -aggressive-instcombine -instcombine -S < %s | FileCheck %s --check-prefix=AIC_AND_IC
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define i16 @foo(i1 %a) {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: [[TRUNC:%.*]] = select i1 [[A:%.*]], i16 32767, i16 0
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; CHECK-NEXT: ret i16 [[TRUNC]]
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;
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; IC-LABEL: @foo(
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; IC-NEXT: [[TRUNC:%.*]] = select i1 [[A:%.*]], i16 32767, i16 0
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; IC-NEXT: ret i16 [[TRUNC]]
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;
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; AIC_AND_IC-LABEL: @foo(
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; AIC_AND_IC-NEXT: [[LSHR:%.*]] = select i1 [[A:%.*]], i16 32767, i16 0
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; AIC_AND_IC-NEXT: ret i16 [[LSHR]]
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;
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%sext = sext i1 %a to i16
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%zext = zext i16 %sext to i32
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%lshr = lshr i32 %zext, 1
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%trunc = trunc i32 %lshr to i16
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ret i16 %trunc
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}
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define i16 @foo2(i1 %a) {
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; CHECK-LABEL: @foo2(
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; CHECK-NEXT: [[LSHR:%.*]] = select i1 [[A:%.*]], i16 32767, i16 0
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; CHECK-NEXT: ret i16 [[LSHR]]
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;
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; IC-LABEL: @foo2(
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; IC-NEXT: [[LSHR:%.*]] = select i1 [[A:%.*]], i16 32767, i16 0
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; IC-NEXT: ret i16 [[LSHR]]
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;
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; AIC_AND_IC-LABEL: @foo2(
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; AIC_AND_IC-NEXT: [[LSHR:%.*]] = select i1 [[A:%.*]], i16 32767, i16 0
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; AIC_AND_IC-NEXT: ret i16 [[LSHR]]
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;
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%s = sext i1 %a to i16
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%lshr = lshr i16 %s, 1
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ret i16 %lshr
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}
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