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1223486e31
On PowerPC, FNMSUB (both VSX and non-VSX version) means -(a*b-c). But the backend used to generate these instructions regardless whether nsz flag exists or not. If a*b-c==0, such transformation changes sign of zero. This patch introduces PPC specific FNMSUB ISD opcode, which may help improving combined FMA code sequence. Reviewed By: steven.zhang Differential Revision: https://reviews.llvm.org/D76585
164 lines
5.4 KiB
LLVM
164 lines
5.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -verify-machineinstrs -mcpu=pwr9 -mtriple=powerpc64le-linux-gnu | FileCheck %s
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; Verify that the fold of a*b-c*d respect the uses of a*b
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define double @fsub1(double %a, double %b, double %c, double %d) {
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; CHECK-LABEL: fsub1:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: xsmuldp 0, 2, 1
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; CHECK-NEXT: fmr 1, 0
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; CHECK-NEXT: xsnmsubadp 1, 4, 3
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; CHECK-NEXT: xsmuldp 1, 0, 1
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; CHECK-NEXT: blr
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entry:
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%mul = fmul reassoc double %b, %a
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%mul1 = fmul reassoc double %d, %c
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%sub = fsub reassoc nsz double %mul, %mul1
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%mul3 = fmul reassoc double %mul, %sub
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ret double %mul3
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}
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; Verify that the fold of a*b-c*d respect the uses of c*d
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define double @fsub2(double %a, double %b, double %c, double %d) {
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; CHECK-LABEL: fsub2:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: xsmuldp 0, 4, 3
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; CHECK-NEXT: fmr 3, 0
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; CHECK-NEXT: xsmsubadp 3, 2, 1
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; CHECK-NEXT: xsmuldp 1, 0, 3
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; CHECK-NEXT: blr
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entry:
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%mul = fmul reassoc double %b, %a
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%mul1 = fmul reassoc double %d, %c
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%sub = fsub reassoc double %mul, %mul1
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%mul3 = fmul reassoc double %mul1, %sub
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ret double %mul3
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}
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; Verify that the fold of a*b-c*d if there is no uses of a*b and c*d
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define double @fsub3(double %a, double %b, double %c, double %d) {
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; CHECK-LABEL: fsub3:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: xsmuldp 0, 4, 3
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; CHECK-NEXT: xsmsubadp 0, 2, 1
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; CHECK-NEXT: fmr 1, 0
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; CHECK-NEXT: blr
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entry:
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%mul = fmul reassoc double %b, %a
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%mul1 = fmul reassoc double %d, %c
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%sub = fsub reassoc double %mul, %mul1
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ret double %sub
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}
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; Verify that the fold of a*b+c*d respect the uses of a*b
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define double @fadd1(double %a, double %b, double %c, double %d) {
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; CHECK-LABEL: fadd1:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: xsmuldp 0, 2, 1
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; CHECK-NEXT: fmr 1, 0
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; CHECK-NEXT: xsmaddadp 1, 4, 3
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; CHECK-NEXT: xsmuldp 1, 0, 1
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; CHECK-NEXT: blr
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entry:
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%mul = fmul reassoc double %b, %a
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%mul1 = fmul reassoc double %d, %c
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%add = fadd reassoc double %mul1, %mul
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%mul3 = fmul reassoc double %mul, %add
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ret double %mul3
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}
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; Verify that the fold of a*b+c*d respect the uses of c*d
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define double @fadd2(double %a, double %b, double %c, double %d) {
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; CHECK-LABEL: fadd2:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: xsmuldp 0, 4, 3
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; CHECK-NEXT: fmr 3, 0
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; CHECK-NEXT: xsmaddadp 3, 2, 1
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; CHECK-NEXT: xsmuldp 1, 0, 3
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; CHECK-NEXT: blr
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entry:
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%mul = fmul reassoc double %b, %a
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%mul1 = fmul reassoc double %d, %c
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%add = fadd reassoc double %mul1, %mul
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%mul3 = fmul reassoc double %mul1, %add
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ret double %mul3
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}
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; Verify that the fold of a*b+c*d if there is no uses of a*b and c*d
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define double @fadd3(double %a, double %b, double %c, double %d) {
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; CHECK-LABEL: fadd3:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: xsmuldp 1, 2, 1
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; CHECK-NEXT: xsmaddadp 1, 4, 3
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; CHECK-NEXT: blr
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entry:
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%mul = fmul reassoc double %b, %a
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%mul1 = fmul reassoc double %d, %c
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%add = fadd reassoc double %mul1, %mul
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ret double %add
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}
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define double @fma_multi_uses1(double %a, double %b, double %c, double %d, double* %p1, double* %p2, double* %p3) {
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; CHECK-LABEL: fma_multi_uses1:
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; CHECK: # %bb.0:
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; CHECK-NEXT: xsmuldp 1, 1, 2
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; CHECK-NEXT: xsmuldp 0, 3, 4
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; CHECK-NEXT: stfd 1, 0(7)
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; CHECK-NEXT: stfd 1, 0(8)
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; CHECK-NEXT: xsnmsubadp 1, 3, 4
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; CHECK-NEXT: stfd 0, 0(9)
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; CHECK-NEXT: blr
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%ab = fmul reassoc double %a, %b
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%cd = fmul reassoc double %c, %d
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store double %ab, double* %p1 ; extra use of %ab
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store double %ab, double* %p2 ; another extra use of %ab
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store double %cd, double* %p3 ; extra use of %cd
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%r = fsub reassoc nsz double %ab, %cd
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ret double %r
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}
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define double @fma_multi_uses2(double %a, double %b, double %c, double %d, double* %p1, double* %p2, double* %p3) {
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; CHECK-LABEL: fma_multi_uses2:
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; CHECK: # %bb.0:
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; CHECK-NEXT: xsmuldp 5, 1, 2
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; CHECK-NEXT: xsmuldp 0, 3, 4
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; CHECK-NEXT: stfd 5, 0(7)
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; CHECK-NEXT: stfd 0, 0(8)
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; CHECK-NEXT: stfd 0, 0(9)
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; CHECK-NEXT: xsmsubadp 0, 1, 2
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; CHECK-NEXT: fmr 1, 0
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; CHECK-NEXT: blr
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%ab = fmul reassoc double %a, %b
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%cd = fmul reassoc double %c, %d
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store double %ab, double* %p1 ; extra use of %ab
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store double %cd, double* %p2 ; extra use of %cd
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store double %cd, double* %p3 ; another extra use of %cd
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%r = fsub reassoc double %ab, %cd
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ret double %r
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}
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define double @fma_multi_uses3(double %a, double %b, double %c, double %d, double %f, double %g, double* %p1, double* %p2, double* %p3) {
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; CHECK-LABEL: fma_multi_uses3:
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; CHECK: # %bb.0:
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; CHECK-NEXT: xsmuldp 0, 1, 2
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; CHECK-NEXT: xsmuldp 1, 5, 6
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; CHECK-NEXT: ld 3, 96(1)
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; CHECK-NEXT: stfd 0, 0(9)
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; CHECK-NEXT: stfd 0, 0(10)
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; CHECK-NEXT: stfd 1, 0(3)
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; CHECK-NEXT: xsnmsubadp 1, 3, 4
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; CHECK-NEXT: xsnmsubadp 0, 3, 4
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; CHECK-NEXT: xsadddp 1, 0, 1
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; CHECK-NEXT: blr
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%ab = fmul reassoc double %a, %b
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%cd = fmul reassoc double %c, %d
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%fg = fmul reassoc double %f, %g
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store double %ab, double* %p1 ; extra use of %ab
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store double %ab, double* %p2 ; another extra use of %ab
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store double %fg, double* %p3 ; extra use of %fg
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%q = fsub reassoc nsz double %fg, %cd ; The uses of %cd reduce to 1 after %r is folded. 2 uses of %fg, fold %cd, remove def of %cd
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%r = fsub reassoc nsz double %ab, %cd ; Fold %r before %q. 3 uses of %ab, 2 uses of %cd, fold %cd
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%add = fadd reassoc double %r, %q
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ret double %add
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}
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