https://llvm.org/bugs/show_bug.cgi?id=23038
Bug ID: 23038
Summary: float2int miscompile
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: unassignedbugs at nondot.org
Reporter: nlewycky at google.com
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
Created attachment 14106
--> https://llvm.org/bugs/attachment.cgi?id=14106&action=edit
C testcase
opt -float2int transforms this:
define i32 @test(i8 %call) {
%conv1 = sitofp i8 %call to float
%mul = fmul float %conv1, -3.000000e+00
%conv2 = fptosi float %mul to i8
%conv3 = sext i8 %conv2 to i32
ret i32 %conv3
}
into this:
define i32 @test(i8 %call) {
%1 = sext i8 %call to i32
%mul1 = mul i32 %1, 0 ;; XXX nope
%2 = trunc i32 %mul1 to i8
%conv3 = sext i8 %2 to i32
ret i32 %conv3
}
See attached .cc testcase that fails with "clang -O2 -fno-inline" (by printing
"0 -27 0" when it should print "-27 -27 1").
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