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ab5c703fdb
state. Previously Thumb2 would restore sp from fp like this: mov sp, r7 sub, sp, #4 If an interrupt is taken after the 'mov' but before the 'sub', callee-saved registers might be clobbered by the interrupt handler. Instead, try restoring directly from sp: add sp, #4 Or, if necessary (with VLA, etc.) use a scratch register to compute sp and then restore it: sub.w r4, r7, #8 mov sp, r7 rdar://8465407 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119977 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
719 B
LLVM
30 lines
719 B
LLVM
; RUN: llc < %s -mtriple=thumbv7-none-linux-gnueabi | FileCheck %s
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; PR4659
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; PR4682
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define hidden i32 @__gcov_execlp(i8* %path, i8* %arg, ...) nounwind {
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entry:
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; CHECK: __gcov_execlp:
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; CHECK: sub sp, #8
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; CHECK: push
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; CHECK: add r7, sp, #4
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; CHECK: subs r4, r7, #4
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; CHECK: mov sp, r4
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; CHECK-NOT: mov sp, r7
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; CHECK: add sp, #8
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call void @__gcov_flush() nounwind
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br i1 undef, label %bb5, label %bb
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bb: ; preds = %bb, %entry
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br i1 undef, label %bb5, label %bb
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bb5: ; preds = %bb, %entry
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%0 = alloca i8*, i32 undef, align 4 ; <i8**> [#uses=1]
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%1 = call i32 @execvp(i8* %path, i8** %0) nounwind ; <i32> [#uses=1]
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ret i32 %1
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}
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declare hidden void @__gcov_flush()
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declare i32 @execvp(i8*, i8**) nounwind
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