79564611d9
This enables use of the 'S' constraint for inline ASM operands on SystemZ, which allows for a memory reference with a signed 20-bit immediate displacement. This patch includes corresponding documentation and test case updates. I've changed the 'T' constraint to match the new behavior for 'S', as 'T' also uses a long displacement (though index constraints are still not implemented). I also changed 'm' to match the behavior for 'S' as this will allow for a wider range of displacements for 'm', though correct me if that's not the right decision. Author: colpell Differential Revision: http://reviews.llvm.org/D21097 llvm-svn: 272266
16 lines
447 B
LLVM
16 lines
447 B
LLVM
; Test the "m" asm constraint, which is equivalent to "T".
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -no-integrated-as | FileCheck %s
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define void @f1(i64 %base) {
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; CHECK-LABEL: f1:
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; CHECK: blah 0(%r2)
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; CHECK: br %r14
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%addr = inttoptr i64 %base to i64 *
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call void asm "blah $0", "=*m" (i64 *%addr)
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ret void
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}
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; FIXME: at the moment the precise constraint is not passed down to
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; target code, so we must conservatively treat "m" as "S".
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