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14957cb237
HexagonGenMux would collapse pairs of predicated transfers if it assumed that the predicated .new forms cannot be created. Turns out that generating mux is preferable in almost all cases. Introduce an option -hexagon-gen-mux-threshold that controls the minimum distance between the instruction defining the predicate and the later of the two transfers. If the distance is closer than the threshold, mux will not be generated. Set the threshold to 0 by default. llvm-svn: 328346
25 lines
634 B
LLVM
25 lines
634 B
LLVM
; RUN: llc -march=hexagon -O2 -hexagon-expand-condsets=true -hexagon-gen-mux-threshold=4 < %s | FileCheck %s
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; CHECK-NOT: mux(p
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target triple = "hexagon"
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define void @f0() #0 {
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b0:
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%v0 = load i32, i32* null, align 4
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%v1 = icmp slt i32 undef, %v0
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%v2 = zext i1 %v1 to i32
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%v3 = icmp sgt i32 undef, 0
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%v4 = zext i1 %v3 to i32
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%v5 = add nsw i32 %v2, %v4
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store i32 %v5, i32* undef, align 4
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br i1 undef, label %b1, label %b2
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b1: ; preds = %b0
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br label %b2
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b2: ; preds = %b1, %b0
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unreachable
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}
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attributes #0 = { nounwind }
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