llvm/asm-05.ll at 17676e0febecf0b2a9781477c049acf5e093dc6c - llvm - Gitea: Git with a cup of tea

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Ulrich Weigand 603d680eb5 [SystemZ] Enable index register memory constraints for inline ASM

This enables use of the 'R' and 'T' memory constraints for inline ASM
operands on SystemZ, which allow an index register as well as an
immediate displacement. This patch includes corresponding documentation
and test case updates.

As with the last patch of this kind, I moved the 'm' constraint to the
most general case, which is now 'T' (base + 20-bit signed displacement +
index register).

Author: colpell
Differential Revision: http://reviews.llvm.org/D21239



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272547 91177308-0d34-0410-b5e6-96231b3b80d8

2016-06-13 14:24:05 +00:00

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 ; Test the "m" asm constraint, which is equivalent to "T".
 ;
 ; RUN: llc < %s -mtriple=s390x-linux-gnu -no-integrated-as | FileCheck %s
 define void @f1(i64 %base) {
 ; CHECK-LABEL: f1:
 ; CHECK: blah 0(%r2)
 ; CHECK: br %r14
   %addr = inttoptr i64 %base to i64 *
   call void asm "blah $0", "=*m" (i64 *%addr)
   ret void
 }