RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2024-10-19 19:12:56 +02:00
Code Issues Projects Releases Wiki Activity

[X86] Add more test cases for fast-isel handling of fneg.

Browse Source 
The fneg double case is falling back to a subsd in 32-bit mode if you write a test that doesn't trigger a fast-isel abort on the return value.

The subsd lowering has different behavior with respect to nans than using an xor. This is inconsisent with what we would do in SelectionDAG
and can lead to differences between -O0 and -O2.

llvm-svn: 360088
This commit is contained in:
Craig Topper 2019-05-06 22:04:26 +00:00
parent 32c2919cd9
commit a8ee84b04a
1 changed files with 53 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
test/CodeGen/X86/fast-isel-fneg.ll
View File

@ -1,6 +1,6 @@
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -fast-isel -fast-isel-abort=1 -mtriple=x86_64-apple-darwin10 | FileCheck %s
; RUN: llc < %s -fast-isel -mtriple=i686-- -mattr=+sse2 | FileCheck --check-prefix=SSE2 %s
; RUN: llc < %s -fast-isel -fast-isel-abort=3 -mtriple=x86_64-apple-darwin10 | FileCheck %s
; RUN: llc < %s -fast-isel -fast-isel-abort=1 -mtriple=i686-- -mattr=+sse2 | FileCheck --check-prefix=SSE2 %s
define double @doo(double %x) nounwind {
; CHECK-LABEL: doo:
@ -48,3 +48,54 @@ define float @foo(float %x) nounwind {
%y = fsub float -0.0, %x
ret float %y
}
define void @goo(double* %x, double* %y) nounwind {
; CHECK-LABEL: goo:
; CHECK: ## %bb.0:
; CHECK-NEXT: movq {{.*#+}} xmm0 = mem[0],zero
; CHECK-NEXT: movq %xmm0, %rax
; CHECK-NEXT: movabsq $-9223372036854775808, %rcx ## imm = 0x8000000000000000
; CHECK-NEXT: xorq %rax, %rcx
; CHECK-NEXT: movq %rcx, %xmm0
; CHECK-NEXT: movq %xmm0, (%rsi)
; CHECK-NEXT: retq
;
; SSE2-LABEL: goo:
; SSE2: # %bb.0:
; SSE2-NEXT: movl {{[0-9]+}}(%esp), %eax
; SSE2-NEXT: movl {{[0-9]+}}(%esp), %ecx
; SSE2-NEXT: movsd {{.*#+}} xmm0 = mem[0],zero
; SSE2-NEXT: subsd (%ecx), %xmm0
; SSE2-NEXT: movsd %xmm0, (%eax)
; SSE2-NEXT: retl
%a = load double, double* %x
%b = fsub double -0.0, %a
store double %b, double* %y
ret void
}
define void @loo(float* %x, float* %y) nounwind {
; CHECK-LABEL: loo:
; CHECK: ## %bb.0:
; CHECK-NEXT: movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: xorl $2147483648, %eax ## imm = 0x80000000
; CHECK-NEXT: movd %eax, %xmm0
; CHECK-NEXT: movd %xmm0, (%rsi)
; CHECK-NEXT: retq
;
; SSE2-LABEL: loo:
; SSE2: # %bb.0:
; SSE2-NEXT: movl {{[0-9]+}}(%esp), %eax
; SSE2-NEXT: movl {{[0-9]+}}(%esp), %ecx
; SSE2-NEXT: movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
; SSE2-NEXT: movd %xmm0, %ecx
; SSE2-NEXT: xorl $2147483648, %ecx # imm = 0x80000000
; SSE2-NEXT: movd %ecx, %xmm0
; SSE2-NEXT: movd %xmm0, (%eax)
; SSE2-NEXT: retl
%a = load float, float* %x
%b = fsub float -0.0, %a
store float %b, float* %y
ret void
}