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3a7df35715
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
51 lines
1.2 KiB
LLVM
51 lines
1.2 KiB
LLVM
; Test the "S" asm constraint, which accepts addresses that have a base
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; and a 20-bit displacement.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -no-integrated-as | FileCheck %s
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; Check the lowest range.
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define void @f1(i64 %base) {
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; CHECK-LABEL: f1:
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; CHECK: blah -524288(%r2)
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; CHECK: br %r14
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%add = add i64 %base, -524288
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%addr = inttoptr i64 %add to i64 *
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call void asm "blah $0", "=*S" (i64 *%addr)
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ret void
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}
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; Check the next lowest byte.
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define void @f2(i64 %base) {
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; CHECK-LABEL: f2:
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; CHECK: agfi %r2, -524289
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; CHECK: blah 0(%r2)
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; CHECK: br %r14
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%add = add i64 %base, -524289
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%addr = inttoptr i64 %add to i64 *
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call void asm "blah $0", "=*S" (i64 *%addr)
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ret void
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}
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; Check the highest range.
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define void @f3(i64 %base) {
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; CHECK-LABEL: f3:
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; CHECK: blah 524287(%r2)
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; CHECK: br %r14
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%add = add i64 %base, 524287
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%addr = inttoptr i64 %add to i64 *
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call void asm "blah $0", "=*S" (i64 *%addr)
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ret void
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}
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; Check the next highest byte.
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define void @f4(i64 %base) {
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; CHECK-LABEL: f4:
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; CHECK: agfi %r2, 524288
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; CHECK: blah 0(%r2)
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; CHECK: br %r14
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%add = add i64 %base, 524288
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%addr = inttoptr i64 %add to i64 *
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call void asm "blah $0", "=*S" (i64 *%addr)
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ret void
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}
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