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llvm-project/llvm/test/CodeGen/SystemZ/args-08.ll

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[SystemZ] Support large LLVM IR struct return values Recent mesa/llvmpipe crashes on SystemZ due to a failed assertion when attempting to compile a routine with a return type of { <4 x float>, <4 x float>, <4 x float>, <4 x float> } on a system without vector instruction support. This is because after legalizing the vector type, we get a return value consisting of 16 floats, which cannot all be returned in registers. Usually, what should happen in this case is that the target's CanLowerReturn routine rejects the return type, in which case SelectionDAG falls back to implementing a structure return in memory via implicit reference. However, the SystemZ target never actually implemented any CanLowerReturn routine, and thus would accept any struct return type. This patch fixes the crash by implementing CanLowerReturn. As a side effect, this also handles fp128 return values, fixing a todo that was noted in SystemZCallingConv.td. llvm-svn: 244889
2015-08-13 21:37:06 +08:00
; Test calling functions with multiple return values (LLVM ABI extension)
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
; Up to four integer return values fit into GPRs.
declare { i64, i64, i64, i64 } @bar1()
define i64 @f1() {
; CHECK-LABEL: f1:
; CHECK: brasl %r14, bar1
; CHECK: lgr %r2, %r5
; CHECK: br %r14
%mret = call { i64, i64, i64, i64 } @bar1()
%ret = extractvalue { i64, i64, i64, i64 } %mret, 3
ret i64 %ret
}
; More than four integer return values use sret.
declare { i64, i64, i64, i64, i64 } @bar2()
define i64 @f2() {
; CHECK-LABEL: f2:
; CHECK: la %r2, 160(%r15)
; CHECK: brasl %r14, bar2
; CHECK: lg %r2, 192(%r15)
; CHECK: br %r14
%mret = call { i64, i64, i64, i64, i64 } @bar2()
%ret = extractvalue { i64, i64, i64, i64, i64 } %mret, 4
ret i64 %ret
}
; Up to four floating-point return values fit into GPRs.
declare { double, double, double, double } @bar3()
define double @f3() {
; CHECK-LABEL: f3:
; CHECK: brasl %r14, bar3
; CHECK: ldr %f0, %f6
; CHECK: br %r14
%mret = call { double, double, double, double } @bar3()
%ret = extractvalue { double, double, double, double } %mret, 3
ret double %ret
}
; More than four integer return values use sret.
declare { double, double, double, double, double } @bar4()
define double @f4() {
; CHECK-LABEL: f4:
; CHECK: la %r2, 160(%r15)
; CHECK: brasl %r14, bar4
; CHECK: ld %f0, 192(%r15)
; CHECK: br %r14
%mret = call { double, double, double, double, double } @bar4()
%ret = extractvalue { double, double, double, double, double } %mret, 4
ret double %ret
}