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instcombine: Migrate *abs optimizations

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This patch migrates the *abs optimizations from the simplify-libcalls
pass into the instcombine library call simplifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@168574 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Meador Inge
2012-11-26 00:24:07 +00:00
parent 15d099a790
commit dfb3b1a779
4 changed files with 63 additions and 36 deletions
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41
test/Transforms/InstCombine/abs-1.ll Normal file
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@@ -0,0 +1,41 @@
; Test that the abs library call simplifier works correctly.
;
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
declare i32 @abs(i32)
declare i64 @labs(i64)
declare i64 @llabs(i64)
; Check abs(x) -> x >s -1 ? x : -x.
define i32 @test_simplify1(i32 %x) {
; CHECK: @test_simplify1
%ret = call i32 @abs(i32 %x)
; CHECK-NEXT: [[ISPOS:%[a-z0-9]+]] = icmp sgt i32 %x, -1
; CHECK-NEXT: [[NEG:%[a-z0-9]+]] = sub i32 0, %x
; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[ISPOS]], i32 %x, i32 [[NEG]]
ret i32 %ret
; CHECK-NEXT: ret i32 [[RET]]
}
define i64 @test_simplify2(i64 %x) {
; CHECK: @test_simplify2
%ret = call i64 @labs(i64 %x)
; CHECK-NEXT: [[ISPOS:%[a-z0-9]+]] = icmp sgt i64 %x, -1
; CHECK-NEXT: [[NEG:%[a-z0-9]+]] = sub i64 0, %x
; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[ISPOS]], i64 %x, i64 [[NEG]]
ret i64 %ret
; CHECK-NEXT: ret i64 [[RET]]
}
define i64 @test_simplify3(i64 %x) {
; CHECK: @test_simplify3
%ret = call i64 @llabs(i64 %x)
; CHECK-NEXT: [[ISPOS:%[a-z0-9]+]] = icmp sgt i64 %x, -1
; CHECK-NEXT: [[NEG:%[a-z0-9]+]] = sub i64 0, %x
; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[ISPOS]], i64 %x, i64 [[NEG]]
ret i64 %ret
; CHECK-NEXT: ret i64 [[RET]]
}