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llvm-project/llvm/test/CodeGen/SystemZ/regalloc-GR128.ll

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[SystemZ] implement shouldCoalesce() Implement shouldCoalesce() to help regalloc avoid running out of GR128 registers. If a COPY involving a subreg of a GR128 is coalesced, the live range of the GR128 virtual register will be extended. If this happens where there are enough phys-reg clobbers present, regalloc will run out of registers (if there is not a single GR128 allocatable register available). This patch tries to allow coalescing only when it can prove that this will be safe by checking the (local) interval in question. Review: Ulrich Weigand, Quentin Colombet https://reviews.llvm.org/D37899 https://bugs.llvm.org/show_bug.cgi?id=34610 llvm-svn: 314516
2017-09-29 22:31:39 +08:00
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 -O3 -o /dev/null
;
; Test that regalloc does not run out of registers
; This test will include a GR128 virtual reg.
define void @test0(i64 %dividend, i64 %divisor) {
%rem = urem i64 %dividend, %divisor
call void asm sideeffect "", "{r0},{r1},{r2},{r3},{r4},{r5},{r6},{r7},{r8},{r9},{r10},{r11},{r12},{r13},{r14}"(i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 %rem)
ret void
}
; This test will include an ADDR128 virtual reg.
define i64 @test1(i64 %dividend, i64 %divisor) {
%rem = urem i64 %dividend, %divisor
call void asm sideeffect "", "{r2},{r3},{r4},{r5},{r6},{r7},{r8},{r9},{r10},{r11},{r12},{r13},{r14}"(i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 %rem)
%ret = add i64 %rem, 1
ret i64 %ret
}