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a6ee5ed23a
Materializing something like "-3" can be done as 2 instructions: MOV r0, #3 MVN r0, r0 This has a cost of 2, not 3. It looks like we were already trying to detect this pattern in TII::getIntImmCost(), but were taking the complement of the zero-extended value instead of the sign-extended value which is unlikely to ever produce a number < 256. There were no tests failing after changing this... :/ llvm-svn: 280928
22 lines
469 B
LLVM
22 lines
469 B
LLVM
; RUN: llc %s -o - -O1 -debug-only=consthoist 2>&1 | FileCheck %s
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; REQUIRES: asserts
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target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
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target triple = "thumbv6m-apple-ios8.0.0"
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declare void @g(i32)
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; CHECK: Collect constant i32 -3 from call void @g(i32 -3) with cost 2
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define void @f(i1 %cond) {
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entry:
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call void @g(i32 -3)
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br i1 %cond, label %true, label %ret
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true:
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call void @g(i32 -3)
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br label %ret
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ret:
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ret void
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}
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