llvm/test/CodeGen/SystemZ/asm-04.ll
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

74 lines
1.8 KiB
LLVM

; Test the "T" asm constraint, which accepts addresses that have a base,
; an index and a 20-bit displacement.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -no-integrated-as | FileCheck %s
; Check the lowest range.
define void @f1(i64 %base) {
; CHECK-LABEL: f1:
; CHECK: blah -524288(%r2)
; CHECK: br %r14
%add = add i64 %base, -524288
%addr = inttoptr i64 %add to i64 *
call void asm "blah $0", "=*T" (i64 *%addr)
ret void
}
; Check the next lowest byte.
define void @f2(i64 %base) {
; CHECK-LABEL: f2:
; CHECK: agfi %r2, -524289
; CHECK: blah 0(%r2)
; CHECK: br %r14
%add = add i64 %base, -524289
%addr = inttoptr i64 %add to i64 *
call void asm "blah $0", "=*T" (i64 *%addr)
ret void
}
; Check the highest range.
define void @f3(i64 %base) {
; CHECK-LABEL: f3:
; CHECK: blah 524287(%r2)
; CHECK: br %r14
%add = add i64 %base, 524287
%addr = inttoptr i64 %add to i64 *
call void asm "blah $0", "=*T" (i64 *%addr)
ret void
}
; Check the next highest byte.
define void @f4(i64 %base) {
; CHECK-LABEL: f4:
; CHECK: agfi %r2, 524288
; CHECK: blah 0(%r2)
; CHECK: br %r14
%add = add i64 %base, 524288
%addr = inttoptr i64 %add to i64 *
call void asm "blah $0", "=*T" (i64 *%addr)
ret void
}
; Check that indices are allowed
define void @f5(i64 %base, i64 %index) {
; CHECK-LABEL: f5:
; CHECK: blah 0(%r3,%r2)
; CHECK: br %r14
%add = add i64 %base, %index
%addr = inttoptr i64 %add to i64 *
call void asm "blah $0", "=*T" (i64 *%addr)
ret void
}
; Check that indices and displacements are allowed simultaneously
define void @f6(i64 %base, i64 %index) {
; CHECK-LABEL: f6:
; CHECK: blah 524287(%r3,%r2)
; CHECK: br %r14
%add = add i64 %base, 524287
%addi = add i64 %add, %index
%addr = inttoptr i64 %addi to i64 *
call void asm "blah $0", "=*T" (i64 *%addr)
ret void
}