http://llvm.org/bugs/show_bug.cgi?id=9473
Summary: sitofp isel failed for x86 AVX backend.
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
AssignedTo: unassignedb...@nondot.org
ReportedBy: syoyofuj...@gmail.com
CC: llvmbugs@cs.uiuc.edu
OS: Linux 64bit
Target-triple: x86_64-unknown-linux-gnu
LLVM revision: r127562
In the following int-to-double cast expression, x86 AVX backend reports "Cannot
select" error.
// test.c
int
main()
{
double x;
int i;
x = i;
}
$ clang -c -emit-llvm test.c
$ llvm -mattr=+avx test.o
fatal error: error in backend: Cannot select: 0x3cd30e0: f64 = sint_to_fp
0x3cd2fe0 [ORD=3] [ID=8]
0x3cd2fe0: i32,ch = load 0x3cd2de0, 0x3cd2ee0, 0x3cd2ce0<LD4[%i]> [ORD=2]
[ID=7]
0x3cd2ee0: i64 = FrameIndex<2> [ORD=2] [ID=4]
0x3cd2ce0: i64 = undef [ORD=1] [ID=3]
// llvm-dis test.o
; ModuleID = 'test.o'
target datalayout =
"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-unknown-linux-gnu"
define i32 @main() nounwind {
entry:
%retval = alloca i32, align 4
%x = alloca double, align 8
%i = alloca i32, align 4
store i32 0, i32* %retval
%tmp = load i32* %i, align 4
%conv = sitofp i32 %tmp to double
store double %conv, double* %x, align 8
%0 = load i32* %retval
ret i32 %0
}
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