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3063960b2e
This patch teaches X86FastISel how to select AVX instructions for scalar
float/double convert operations.
Before this patch, X86FastISel always selected legacy SSE instructions
for FPExt (from float to double) and FPTrunc (from double to float).
For example:
\code
define double @foo(float %f) {
%conv = fpext float %f to double
ret double %conv
}
\end code
Before (with -mattr=+avx -fast-isel) X86FastIsel selected a CVTSS2SDrr which is
legacy SSE:
cvtss2sd %xmm0, %xmm0
With this patch, X86FastIsel selects a VCVTSS2SDrr instead:
vcvtss2sd %xmm0, %xmm0, %xmm0
Added test fast-isel-fptrunc-fpext.ll to check both the register-register and
the register-memory float/double conversion variants.
Differential Revision: http://reviews.llvm.org/D7438
llvm-svn: 228682
66 lines
1.7 KiB
LLVM
66 lines
1.7 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+sse2 -fast-isel | FileCheck %s --check-prefix=ALL --check-prefix=SSE
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; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx -fast-isel | FileCheck %s --check-prefix=ALL --check-prefix=AVX
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;
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; Verify that fast-isel doesn't select legacy SSE instructions on targets that
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; feature AVX.
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;
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; Test cases are obtained from the following code snippet:
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; ///
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; double single_to_double_rr(float x) {
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; return (double)x;
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; }
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; float double_to_single_rr(double x) {
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; return (float)x;
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; }
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; double single_to_double_rm(float *x) {
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; return (double)*x;
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; }
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; float double_to_single_rm(double *x) {
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; return (float)*x;
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; }
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; ///
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define double @single_to_double_rr(float %x) {
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; ALL-LABEL: single_to_double_rr:
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; SSE-NOT: vcvtss2sd
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; AVX: vcvtss2sd %xmm0, %xmm0, %xmm0
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; ALL: ret
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entry:
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%conv = fpext float %x to double
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ret double %conv
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}
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define float @double_to_single_rr(double %x) {
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; ALL-LABEL: double_to_single_rr:
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; SSE-NOT: vcvtsd2ss
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; AVX: vcvtsd2ss %xmm0, %xmm0, %xmm0
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; ALL: ret
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entry:
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%conv = fptrunc double %x to float
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ret float %conv
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}
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define double @single_to_double_rm(float* %x) {
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; ALL-LABEL: single_to_double_rm:
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; SSE: cvtss2sd (%rdi), %xmm0
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; AVX: vmovss (%rdi), %xmm0
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; AVX-NEXT: vcvtss2sd %xmm0, %xmm0, %xmm0
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; ALL-NEXT: ret
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entry:
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%0 = load float* %x, align 4
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%conv = fpext float %0 to double
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ret double %conv
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}
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define float @double_to_single_rm(double* %x) {
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; ALL-LABEL: double_to_single_rm:
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; SSE: cvtsd2ss (%rdi), %xmm0
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; AVX: vmovsd (%rdi), %xmm0
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; AVX-NEXT: vcvtsd2ss %xmm0, %xmm0, %xmm0
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; ALL-NEXT: ret
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entry:
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%0 = load double* %x, align 8
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%conv = fptrunc double %0 to float
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ret float %conv
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}
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