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c143bcf9ac
to generate signed ICMP instructions to replace the FCMP. This would violate
the following:
define i1 @test1(i32 %val) {
%1 = uitofp i32 %val to double
%2 = fcmp ole double %1, 0.000000e+00
ret i1 %2
}
would be transformed into:
define i1 @test1(i32 %val) {
%1 = icmp slt i33 %val, 1
ret i1 %1
}
which is obviously wrong. This patch modifes InstCombiner::FoldFCmp_IntToFP_Cst
to handle when the LHS comes from UIToFP.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58929 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
1.0 KiB
LLVM
47 lines
1.0 KiB
LLVM
; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t
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; RUN: grep {icmp eq} %t
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; RUN: grep {ret i1 false} %t | count 2
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; RUN: grep {ret i1 true} %t | count 2
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; RUN: grep {icmp ne} %t
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; RUN: not grep {icmp slt} %t
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; PR3021
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; When inst combining an FCMP with the LHS coming from a uitofp instruction, we
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; can't lower it to signed ICMP instructions.
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define i1 @test1(i32 %val) {
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%1 = uitofp i32 %val to double
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%2 = fcmp ole double %1, 0.000000e+00
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ret i1 %2
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}
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define i1 @test2(i32 %val) {
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%1 = uitofp i32 %val to double
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%2 = fcmp olt double %1, 0.000000e+00
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ret i1 %2
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}
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define i1 @test3(i32 %val) {
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%1 = uitofp i32 %val to double
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%2 = fcmp oge double %1, 0.000000e+00
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ret i1 %2
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}
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define i1 @test4(i32 %val) {
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%1 = uitofp i32 %val to double
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%2 = fcmp ogt double %1, 0.000000e+00
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ret i1 %2
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}
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define i1 @test5(i32 %val) {
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%1 = uitofp i32 %val to double
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%2 = fcmp ogt double %1, -4.400000e+00
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ret i1 %2
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}
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define i1 @test6(i32 %val) {
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%1 = uitofp i32 %val to double
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%2 = fcmp olt double %1, -4.400000e+00
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ret i1 %2
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}
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