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[x86] add test for missing FMF propagation; NFC 

This is a reduced test for D71495.
This commit is contained in:
Sanjay Patel 2019-12-19 12:16:16 -05:00
parent f8e2ab3cd3
commit 13d30bd54b
1 changed files with 27 additions and 0 deletions
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llvm/test/CodeGen/X86/fmf-reduction.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-- -mattr=fma | FileCheck %s
; FIXME: Propagation of IR FMF should not drop flags when adding the DAG reduction flag.
; This should include an FMA instruction, not separate FMUL/FADD.
define double @julia_dotf(<4 x double> %x, <4 x double> %y, <4 x double> %z, i1 %t3) {
; CHECK-LABEL: julia_dotf:
; CHECK: # %bb.0:
; CHECK-NEXT: vmulpd %ymm1, %ymm0, %ymm0
; CHECK-NEXT: vaddpd %ymm0, %ymm2, %ymm0
; CHECK-NEXT: vextractf128 $1, %ymm0, %xmm1
; CHECK-NEXT: vaddpd %xmm1, %xmm0, %xmm0
; CHECK-NEXT: vpermilpd {{.*#+}} xmm1 = xmm0[1,0]
; CHECK-NEXT: vaddsd %xmm1, %xmm0, %xmm0
; CHECK-NEXT: vzeroupper
; CHECK-NEXT: retq
%t1 = fmul contract <4 x double> %x, %y
%t2 = fadd fast <4 x double> %z, %t1
%rdx.shuf = shufflevector <4 x double> %t2, <4 x double> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef>
%bin.rdx22 = fadd fast <4 x double> %t2, %rdx.shuf
%rdx.shuf23 = shufflevector <4 x double> %bin.rdx22, <4 x double> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef>
%bin.rdx24 = fadd fast <4 x double> %bin.rdx22, %rdx.shuf23
%t4 = extractelement <4 x double> %bin.rdx24, i32 0
ret double %t4
}