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46 lines
1.8 KiB
LLVM
46 lines
1.8 KiB
LLVM
; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
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; Should delete the second call to strlen even though the intervening strchr call exists.
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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"
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target triple = "i386-apple-darwin7"
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define i8* @test(i8* %P, i8* %Q, i32 %x, i32 %y) nounwind readonly {
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entry:
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%0 = tail call i32 @strlen(i8* %P) ; <i32> [#uses=2]
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%1 = icmp eq i32 %0, 0 ; <i1> [#uses=1]
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br i1 %1, label %bb, label %bb1
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bb: ; preds = %entry
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%2 = sdiv i32 %x, %y ; <i32> [#uses=1]
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br label %bb1
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bb1: ; preds = %bb, %entry
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%x_addr.0 = phi i32 [ %2, %bb ], [ %x, %entry ] ; <i32> [#uses=1]
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%3 = tail call i8* @strchr(i8* %Q, i32 97) ; <i8*> [#uses=1]
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%4 = tail call i32 @strlen(i8* %P) ; <i32> [#uses=1]
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%5 = add i32 %x_addr.0, %0 ; <i32> [#uses=1]
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%.sum = sub i32 %5, %4 ; <i32> [#uses=1]
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%6 = getelementptr i8, i8* %3, i32 %.sum ; <i8*> [#uses=1]
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ret i8* %6
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}
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; CHECK: define i8* @test(i8* %P, i8* %Q, i32 %x, i32 %y) #0 {
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; CHECK: entry:
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; CHECK-NEXT: %0 = tail call i32 @strlen(i8* %P)
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; CHECK-NEXT: %1 = icmp eq i32 %0, 0
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; CHECK-NEXT: br i1 %1, label %bb, label %bb1
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; CHECK: bb:
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; CHECK-NEXT: %2 = sdiv i32 %x, %y
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; CHECK-NEXT: br label %bb1
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; CHECK: bb1:
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; CHECK-NEXT: %x_addr.0 = phi i32 [ %2, %bb ], [ %x, %entry ]
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; CHECK-NEXT: %3 = tail call i8* @strchr(i8* %Q, i32 97)
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; CHECK-NEXT: %4 = add i32 %x_addr.0, %0
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; CHECK-NEXT: %5 = getelementptr i8, i8* %3, i32 %x_addr.0
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; CHECK-NEXT: ret i8* %5
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; CHECK: }
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declare i32 @strlen(i8*) nounwind readonly
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declare i8* @strchr(i8*, i32) nounwind readonly
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