8ae0f88b13
A loaded value with multiple users compared with 0 will become a load and test single instruction. The load is not folded in this case (multiple users), but the compare instruction is eliminated. This patch returns 0 cost for the icmp in these cases. Review: Ulrich Weigand https://reviews.llvm.org/D55111 llvm-svn: 348141
26 lines
1.1 KiB
LLVM
26 lines
1.1 KiB
LLVM
; RUN: opt < %s -cost-model -analyze -mtriple=systemz-unknown -mcpu=z13 | FileCheck %s
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;
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; Test that load and test results in 0 cost for the compare.
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define i64 @fun0(i64* %Src, i64 %Arg) {
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%Ld1 = load i64, i64* %Src
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%Cmp = icmp eq i64 %Ld1, 0
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%S = select i1 %Cmp, i64 %Arg, i64 %Ld1
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ret i64 %S
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; CHECK: Printing analysis 'Cost Model Analysis' for function 'fun0':
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; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %Ld1 = load i64, i64* %Src
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; CHECK: Cost Model: Found an estimated cost of 0 for instruction: %Cmp = icmp eq i64 %Ld1, 0
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; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %S = select
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}
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define i32 @fun1(i32* %Src, i32 %Arg) {
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%Ld1 = load i32, i32* %Src
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%Cmp = icmp eq i32 %Ld1, 0
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%S = select i1 %Cmp, i32 %Arg, i32 %Ld1
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ret i32 %S
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; CHECK: Printing analysis 'Cost Model Analysis' for function 'fun1':
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; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %Ld1 = load i32, i32* %Src
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; CHECK: Cost Model: Found an estimated cost of 0 for instruction: %Cmp = icmp eq i32 %Ld1, 0
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; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %S = select
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}
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