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[NFC][Test] Add three tests to verify the behavior of a*b-c*d if there is multi-uses

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QingShan Zhang 2020-03-16 01:58:49 +00:00
parent 6f891c7868
commit f3c97faa61
1 changed files with 67 additions and 0 deletions
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67
test/CodeGen/PowerPC/fma-precision.ll
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@ -97,3 +97,70 @@ entry:
%add = fadd fast double %mul1, %mul
ret double %add
}
define double @fma_multi_uses1(double %a, double %b, double %c, double %d, double* %p1, double* %p2, double* %p3) {
; CHECK-LABEL: fma_multi_uses1:
; CHECK: # %bb.0:
; CHECK-NEXT: xsmuldp 5, 1, 2
; CHECK-NEXT: xsmuldp 0, 3, 4
; CHECK-NEXT: stfd 5, 0(7)
; CHECK-NEXT: stfd 5, 0(8)
; CHECK-NEXT: stfd 0, 0(9)
; CHECK-NEXT: xsmsubadp 0, 1, 2
; CHECK-NEXT: fmr 1, 0
; CHECK-NEXT: blr
%ab = fmul fast double %a, %b
%cd = fmul fast double %c, %d
store double %ab, double* %p1 ; extra use of %ab
store double %ab, double* %p2 ; another extra use of %ab
store double %cd, double* %p3 ; extra use of %cd
%r = fsub fast double %ab, %cd
ret double %r
}
define double @fma_multi_uses2(double %a, double %b, double %c, double %d, double* %p1, double* %p2, double* %p3) {
; CHECK-LABEL: fma_multi_uses2:
; CHECK: # %bb.0:
; CHECK-NEXT: xsmuldp 5, 1, 2
; CHECK-NEXT: xsmuldp 0, 3, 4
; CHECK-NEXT: stfd 5, 0(7)
; CHECK-NEXT: stfd 0, 0(8)
; CHECK-NEXT: stfd 0, 0(9)
; CHECK-NEXT: xsmsubadp 0, 1, 2
; CHECK-NEXT: fmr 1, 0
; CHECK-NEXT: blr
%ab = fmul fast double %a, %b
%cd = fmul fast double %c, %d
store double %ab, double* %p1 ; extra use of %ab
store double %cd, double* %p2 ; extra use of %cd
store double %cd, double* %p3 ; another extra use of %cd
%r = fsub fast double %ab, %cd
ret double %r
}
define double @fma_multi_uses3(double %a, double %b, double %c, double %d, double %f, double %g, double* %p1, double* %p2, double* %p3) {
; CHECK-LABEL: fma_multi_uses3:
; CHECK: # %bb.0:
; CHECK-NEXT: xsmuldp 0, 1, 2
; CHECK-NEXT: xsmuldp 3, 3, 4
; CHECK-NEXT: ld 3, 96(1)
; CHECK-NEXT: stfd 0, 0(9)
; CHECK-NEXT: stfd 0, 0(10)
; CHECK-NEXT: fmr 0, 3
; CHECK-NEXT: xsmsubadp 3, 1, 2
; CHECK-NEXT: xsmsubadp 0, 5, 6
; CHECK-NEXT: xsmuldp 4, 5, 6
; CHECK-NEXT: stfd 4, 0(3)
; CHECK-NEXT: xsadddp 1, 3, 0
; CHECK-NEXT: blr
%ab = fmul fast double %a, %b
%cd = fmul fast double %c, %d
%fg = fmul fast double %f, %g
store double %ab, double* %p1 ; extra use of %ab
store double %ab, double* %p2 ; another extra use of %ab
store double %fg, double* %p3 ; extra use of %fg
%q = fsub fast double %fg, %cd ; The uses of %cd reduce to 1 after %r is folded. 2 uses of %fg, fold %cd, remove def of %cd
%r = fsub fast double %ab, %cd ; Fold %r before %q. 3 uses of %ab, 2 uses of %cd, fold %cd
%add = fadd fast double %r, %q
ret double %add
}