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aa24d0013d
This reverts commit r258830, which introduced a bug described in PR28367. PR28367 llvm-svn: 278938
32 lines
1.1 KiB
LLVM
32 lines
1.1 KiB
LLVM
; RUN: opt < %s -reassociate -S | FileCheck %s
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; CHECK-LABEL: faddsubAssoc1
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; CHECK: [[TMP1:%tmp.*]] = fmul fast half %a, 0xH4500
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; CHECK: [[TMP2:%tmp.*]] = fmul fast half %b, 0xH4500
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; CHECK: fsub fast half [[TMP2]], [[TMP1]]
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; CHECK: ret
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; Input is A op (B op C)
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define half @faddsubAssoc1(half %a, half %b) {
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%tmp1 = fmul fast half %b, 0xH4200 ; 3*b
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%tmp2 = fmul fast half %a, 0xH4500 ; 5*a
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%tmp3 = fmul fast half %b, 0xH4000 ; 2*b
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%tmp4 = fsub fast half %tmp2, %tmp1 ; 5 * a - 3 * b
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%tmp5 = fsub fast half %tmp3, %tmp4 ; 2 * b - ( 5 * a - 3 * b)
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ret half %tmp5 ; = 5 * (b - a)
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}
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; CHECK-LABEL: faddsubAssoc2
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; CHECK: [[TMP1:%tmp.*]] = fmul fast half %a, 0xH4500
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; CHECK: [[TMP2:%tmp.*]] = fmul fast half %b, 0xH3C00
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; CHECK: fadd fast half [[TMP2]], [[TMP1]]
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; CHECK: ret
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; Input is (A op B) op C
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define half @faddsubAssoc2(half %a, half %b) {
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%tmp1 = fmul fast half %b, 0xH4200 ; 3*b
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%tmp2 = fmul fast half %a, 0xH4500 ; 5*a
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%tmp3 = fmul fast half %b, 0xH4000 ; 2*b
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%tmp4 = fadd fast half %tmp2, %tmp1 ; 5 * a + 3 * b
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%tmp5 = fsub fast half %tmp4, %tmp3 ; (5 * a + 3 * b) - (2 * b)
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ret half %tmp5 ; = 5 * a + b
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}
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