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56a5661c60
Function 'ConstantFoldScalarCall' (in ConstantFolding.cpp) works under the
wrong assumption that a call to 'convert.from.fp16' returns a value of
type 'float'.
However, intrinsic 'convert.from.fp16' can be overloaded; for example, we
can call 'convert.from.fp16.f64' to convert from half to double; etc.
Before this patch, the following example would have triggered an assertion
failure in opt (with -constprop):
```
define double @foo() {
entry:
%0 = call double @llvm.convert.from.fp16.f64(i16 0)
ret double %0
}
```
This patch fixes the problem in ConstantFolding.cpp. When folding a call to
convert.from.fp16, we perform a different kind of conversion based on the call
return type.
Added test 'Transform/ConstProp/convert-from-fp16.ll'.
Differential Revision: http://reviews.llvm.org/D9771
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237377 91177308-0d34-0410-b5e6-96231b3b80d8
98 lines
2.8 KiB
LLVM
98 lines
2.8 KiB
LLVM
; RUN: opt -constprop -S < %s | FileCheck %s
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; Verify that we don't crash with an assertion failure when constant folding
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; a call to intrinsic 'convert.from.fp16' if the return type is not 'float'.
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define float @fold_from_fp16_to_fp32() {
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; CHECK-LABEL: @fold_from_fp16_to_fp32
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; CHECK: ret float 0.000000e+00
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entry:
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%0 = call float @llvm.convert.from.fp16.f32(i16 0)
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ret float %0
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}
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define double @fold_from_fp16_to_fp64() {
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; CHECK-LABEL: @fold_from_fp16_to_fp64
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; CHECK: ret double 0.000000e+00
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entry:
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%0 = call double @llvm.convert.from.fp16.f64(i16 0)
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ret double %0
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}
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define x86_fp80 @fold_from_fp16_to_fp80() {
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; CHECK-LABEL: @fold_from_fp16_to_fp80
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; CHECK: ret x86_fp80 0xK00000000000000000000
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entry:
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%0 = call x86_fp80 @llvm.convert.from.fp16.f80(i16 0)
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ret x86_fp80 %0
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}
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define fp128 @fold_from_fp16_to_fp128() {
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; CHECK-LABEL: @fold_from_fp16_to_fp128
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; CHECK: ret fp128 0xL00000000000000000000000000000000
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entry:
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%0 = call fp128 @llvm.convert.from.fp16.f128(i16 0)
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ret fp128 %0
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}
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define ppc_fp128 @fold_from_fp16_to_ppcfp128() {
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; CHECK-LABEL: @fold_from_fp16_to_ppcfp128
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; CHECK: ret ppc_fp128 0xM00000000000000000000000000000000
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entry:
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%0 = call ppc_fp128 @llvm.convert.from.fp16.ppcf128(i16 0)
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ret ppc_fp128 %0
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}
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define float @fold_from_fp16_to_fp32_b() {
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; CHECK-LABEL: @fold_from_fp16_to_fp32_b
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; CHECK: ret float 4.000000e+00
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entry:
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%0 = call i16 @llvm.convert.to.fp16.f64(double 4.0)
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%1 = call float @llvm.convert.from.fp16.f32(i16 %0)
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ret float %1
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}
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define double @fold_from_fp16_to_fp64_b() {
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; CHECK-LABEL: @fold_from_fp16_to_fp64_b
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; CHECK: ret double 4.000000e+00
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entry:
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%0 = call i16 @llvm.convert.to.fp16.f64(double 4.0)
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%1 = call double @llvm.convert.from.fp16.f64(i16 %0)
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ret double %1
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}
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define x86_fp80 @fold_from_fp16_to_fp80_b() {
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; CHECK-LABEL: @fold_from_fp16_to_fp80_b
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; CHECK: ret x86_fp80 0xK40018000000000000000
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entry:
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%0 = call i16 @llvm.convert.to.fp16.f64(double 4.0)
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%1 = call x86_fp80 @llvm.convert.from.fp16.f80(i16 %0)
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ret x86_fp80 %1
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}
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define fp128 @fold_from_fp16_to_fp128_b() {
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; CHECK-LABEL: @fold_from_fp16_to_fp128_b
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; CHECK: ret fp128 0xL00000000000000004001000000000000
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entry:
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%0 = call i16 @llvm.convert.to.fp16.f64(double 4.0)
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%1 = call fp128 @llvm.convert.from.fp16.f128(i16 %0)
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ret fp128 %1
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}
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define ppc_fp128 @fold_from_fp16_to_ppcfp128_b() {
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; CHECK-LABEL: @fold_from_fp16_to_ppcfp128_b
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; CHECK: ret ppc_fp128 0xM40100000000000000000000000000000
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entry:
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%0 = call i16 @llvm.convert.to.fp16.f64(double 4.0)
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%1 = call ppc_fp128 @llvm.convert.from.fp16.ppcf128(i16 %0)
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ret ppc_fp128 %1
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}
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declare i16 @llvm.convert.to.fp16.f64(double)
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declare float @llvm.convert.from.fp16.f32(i16)
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declare double @llvm.convert.from.fp16.f64(i16)
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declare x86_fp80 @llvm.convert.from.fp16.f80(i16)
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declare fp128 @llvm.convert.from.fp16.f128(i16)
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declare ppc_fp128 @llvm.convert.from.fp16.ppcf128(i16)
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