011a503f25
Single instructions exist for i8 and i16 comparisons of memory against a small immediate. This patch makes sure that if the load in these cases has a single user (the ICmp), it gets a 0 cost (folded), and also that the ICmp gets a cost of 1. Review: Ulrich Weigand https://reviews.llvm.org/D54897 llvm-svn: 347733
28 lines
1.3 KiB
LLVM
28 lines
1.3 KiB
LLVM
; RUN: opt < %s -cost-model -analyze -mtriple=systemz-unknown -mcpu=z13 | FileCheck %s
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;
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; Test costs for i8 and i16 comparisons against memory with a small immediate.
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define i32 @fun0(i8* %Src, i8* %Dst, i8 %Val) {
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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 0 for instruction: %Ld = load i8, i8* %Src
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; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %Cmp = icmp eq i8 %Ld, 123
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; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %Ret = zext i1 %Cmp to i32
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; CHECK: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %Ret
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%Ld = load i8, i8* %Src
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%Cmp = icmp eq i8 %Ld, 123
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%Ret = zext i1 %Cmp to i32
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ret i32 %Ret
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}
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define i32 @fun1(i16* %Src, i16* %Dst, i16 %Val) {
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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 0 for instruction: %Ld = load i16, i16* %Src
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; CHECK: Cost Model: Found an estimated cost of 1 for instruction: %Cmp = icmp eq i16
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; CHECK: Cost Model: Found an estimated cost of 2 for instruction: %Ret = zext i1 %Cmp to i32
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; CHECK: Cost Model: Found an estimated cost of 0 for instruction: ret i32 %Ret
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%Ld = load i16, i16* %Src
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%Cmp = icmp eq i16 %Ld, 1234
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%Ret = zext i1 %Cmp to i32
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ret i32 %Ret
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}
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