b3cd44f80b
Summary: Backends should fold the subtraction into the comparison, but not all seem to. Moreover, on targets where pointers are not integers, such as CHERI, an integer subtraction is not appropriate. Instead we should just compare the two pointers directly, as this should work everywhere and potentially generate more efficient code. Reviewers: bogner, lebedev.ri, efriedma, t.p.northover, uweigand, sunfish Reviewed By: lebedev.ri Subscribers: dschuff, sbc100, arichardson, jgravelle-google, hiraditya, aheejin, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D74454
31 lines
1.0 KiB
LLVM
31 lines
1.0 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=wasm32-unknown-unknown < %s | FileCheck -check-prefix=WASM32 %s
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; WASM32: i32.load 28
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; WASM32-NEXT: i32.ne
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; WASM32-NEXT: br_if 0
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; WASM32: __stack_chk_fail
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@"\01LC" = internal constant [11 x i8] c"buf == %s\0A\00" ; <[11 x i8]*> [#uses=1]
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define void @test(i8* %a) nounwind ssp {
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entry:
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%a_addr = alloca i8* ; <i8**> [#uses=2]
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%buf = alloca [8 x i8] ; <[8 x i8]*> [#uses=2]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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store i8* %a, i8** %a_addr
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%buf1 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
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%0 = load i8*, i8** %a_addr, align 4 ; <i8*> [#uses=1]
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%1 = call i8* @strcpy(i8* %buf1, i8* %0) nounwind ; <i8*> [#uses=0]
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%buf2 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
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%2 = call i32 (i8*, ...) @printf(i8* getelementptr ([11 x i8], [11 x i8]* @"\01LC", i32 0, i32 0), i8* %buf2) nounwind ; <i32> [#uses=0]
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br label %return
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return: ; preds = %entry
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ret void
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}
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declare i8* @strcpy(i8*, i8*) nounwind
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declare i32 @printf(i8*, ...) nounwind
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