2009-09-09 00:09:15 +00:00
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; RUN: llc < %s -march=arm
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; RUN: llc < %s -mtriple=arm-linux-gnueabi | grep mov | count 1
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; RUN: llc < %s -mtriple=arm-linux-gnu --disable-fp-elim | \
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Fix epilogue codegen to avoid leaving the stack pointer in an invalid
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
2010-11-22 18:12:04 +00:00
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; RUN: grep mov | count 2
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2009-11-21 23:34:09 +00:00
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; RUN: llc < %s -mtriple=arm-apple-darwin | grep mov | count 2
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2006-08-04 12:48:42 +00:00
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2007-01-31 22:27:07 +00:00
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@str = internal constant [12 x i8] c"Hello World\00"
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2006-08-04 12:48:42 +00:00
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2007-01-31 22:27:07 +00:00
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define i32 @main() {
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%tmp = call i32 @puts( i8* getelementptr ([12 x i8]* @str, i32 0, i64 0) ) ; <i32> [#uses=0]
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ret i32 0
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2006-08-04 12:48:42 +00:00
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}
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2007-01-31 22:27:07 +00:00
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declare i32 @puts(i8*)
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