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https://github.com/c64scene-ar/llvm-6502.git
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48e2671cb6
Canonicalizing 'x [+-] (-Constant * y)' is not a win if we don't *know* we will open up CSE opportunities. If the multiply was 'nsw', then negating 'y' requires us to clear the 'nsw' flag. If this is actually worth pursuing, it is probably more appropriate to do so in GVN or EarlyCSE. This fixes PR23675. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@238397 91177308-0d34-0410-b5e6-96231b3b80d8
157 lines
4.2 KiB
LLVM
157 lines
4.2 KiB
LLVM
; RUN: opt -reassociate -gvn -S < %s | FileCheck %s
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; (x + 0.1234 * y) * (x + -0.1234 * y) -> (x + 0.1234 * y) * (x - 0.1234 * y)
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define double @test1(double %x, double %y) {
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; CHECK-LABEL: @test1
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; CHECK-NEXT: fmul double %y, 1.234000e-01
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; CHECK-NEXT: fadd double %x, %mul
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; CHECK-NEXT: fsub double %x, %mul
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; CHECK-NEXT: fmul double %add{{.*}}, %add{{.*}}
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; CHECK-NEXT: ret double %mul
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%mul = fmul double 1.234000e-01, %y
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%add = fadd double %mul, %x
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%mul1 = fmul double -1.234000e-01, %y
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%add2 = fadd double %mul1, %x
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%mul3 = fmul double %add, %add2
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ret double %mul3
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}
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; (x + -0.1234 * y) * (x + -0.1234 * y) -> (x - 0.1234 * y) * (x - 0.1234 * y)
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define double @test2(double %x, double %y) {
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; CHECK-LABEL: @test2
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; CHECK-NEXT: fmul double %y, 1.234000e-01
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; CHECK-NEXT: fsub double %x, %mul
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; CHECK-NEXT: fmul double %add{{.*}}, %add{{.*}}
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; CHECK-NEXT: ret double %mul
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%mul = fmul double %y, -1.234000e-01
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%add = fadd double %mul, %x
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%mul1 = fmul double %y, -1.234000e-01
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%add2 = fadd double %mul1, %x
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%mul3 = fmul double %add, %add2
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ret double %mul3
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}
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; (x + 0.1234 * y) * (x - -0.1234 * y) -> (x + 0.1234 * y) * (x + 0.1234 * y)
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define double @test3(double %x, double %y) {
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; CHECK-LABEL: @test3
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; CHECK-NEXT: fmul double %y, 1.234000e-01
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; CHECK-NEXT: fadd double %x, %mul
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; CHECK-NEXT: fmul double %add{{.*}}, %add{{.*}}
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; CHECK-NEXT: ret double
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%mul = fmul double %y, 1.234000e-01
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%add = fadd double %mul, %x
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%mul1 = fmul double %y, -1.234000e-01
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%add2 = fsub double %x, %mul1
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%mul3 = fmul double %add, %add2
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ret double %mul3
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}
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; Canonicalize (x - -0.1234 * y)
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define double @test5(double %x, double %y) {
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; CHECK-LABEL: @test5
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; CHECK-NEXT: fmul double %y, 1.234000e-01
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; CHECK-NEXT: fadd double %x, %mul
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; CHECK-NEXT: ret double
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%mul = fmul double -1.234000e-01, %y
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%sub = fsub double %x, %mul
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ret double %sub
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}
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; Don't modify (-0.1234 * y - x)
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define double @test6(double %x, double %y) {
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; CHECK-LABEL: @test6
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; CHECK-NEXT: fmul double %y, -1.234000e-01
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; CHECK-NEXT: fsub double %mul, %x
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; CHECK-NEXT: ret double %sub
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%mul = fmul double -1.234000e-01, %y
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%sub = fsub double %mul, %x
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ret double %sub
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}
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; Canonicalize (-0.1234 * y + x) -> (x - 0.1234 * y)
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define double @test7(double %x, double %y) {
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; CHECK-LABEL: @test7
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; CHECK-NEXT: fmul double %y, 1.234000e-01
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; CHECK-NEXT: fsub double %x, %mul
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; CHECK-NEXT: ret double %add
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%mul = fmul double -1.234000e-01, %y
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%add = fadd double %mul, %x
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ret double %add
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}
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; Canonicalize (y * -0.1234 + x) -> (x - 0.1234 * y)
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define double @test8(double %x, double %y) {
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; CHECK-LABEL: @test8
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; CHECK-NEXT: fmul double %y, 1.234000e-01
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; CHECK-NEXT: fsub double %x, %mul
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; CHECK-NEXT: ret double %add
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%mul = fmul double %y, -1.234000e-01
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%add = fadd double %mul, %x
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ret double %add
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}
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; Canonicalize (x - -0.1234 / y)
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define double @test9(double %x, double %y) {
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; CHECK-LABEL: @test9
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; CHECK-NEXT: fdiv double 1.234000e-01, %y
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; CHECK-NEXT: fadd double %x, %div
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; CHECK-NEXT: ret double
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%div = fdiv double -1.234000e-01, %y
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%sub = fsub double %x, %div
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ret double %sub
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}
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; Don't modify (-0.1234 / y - x)
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define double @test10(double %x, double %y) {
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; CHECK-LABEL: @test10
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; CHECK-NEXT: fdiv double -1.234000e-01, %y
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; CHECK-NEXT: fsub double %div, %x
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; CHECK-NEXT: ret double %sub
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%div = fdiv double -1.234000e-01, %y
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%sub = fsub double %div, %x
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ret double %sub
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}
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; Canonicalize (-0.1234 / y + x) -> (x - 0.1234 / y)
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define double @test11(double %x, double %y) {
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; CHECK-LABEL: @test11
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; CHECK-NEXT: fdiv double 1.234000e-01, %y
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; CHECK-NEXT: fsub double %x, %div
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; CHECK-NEXT: ret double %add
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%div = fdiv double -1.234000e-01, %y
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%add = fadd double %div, %x
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ret double %add
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}
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; Canonicalize (y / -0.1234 + x) -> (x - y / 0.1234)
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define double @test12(double %x, double %y) {
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; CHECK-LABEL: @test12
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; CHECK-NEXT: fdiv double %y, 1.234000e-01
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; CHECK-NEXT: fsub double %x, %div
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; CHECK-NEXT: ret double %add
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%div = fdiv double %y, -1.234000e-01
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%add = fadd double %div, %x
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ret double %add
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}
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; Don't create an NSW violation
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define i4 @test13(i4 %x) {
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; CHECK-LABEL: @test13
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; CHECK-NEXT: %[[mul:.*]] = mul nsw i4 %x, -2
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; CHECK-NEXT: %[[add:.*]] = add i4 %[[mul]], 3
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%mul = mul nsw i4 %x, -2
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%add = add i4 %mul, 3
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ret i4 %add
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}
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