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https://github.com/c64scene-ar/llvm-6502.git
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cc331c8f40
If a function returns a large struct by value return the first 4 words in registers and the rest on the stack in a location reserved by the caller. This is needed to support the xC language which supports functions returning an arbitrary number of return values. This is r202397 reapplied with a fix to avoid an uninitialized read of a member. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202414 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.0 KiB
LLVM
75 lines
2.0 KiB
LLVM
; RUN: llc < %s -march=xcore | FileCheck %s
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%0 = type { i32, i32, i32, i32 }
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%1 = type { i32, i32, i32, i32, i32 }
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; Structs of 4 words are returned in registers
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define internal %0 @ReturnBigStruct() nounwind readnone {
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entry:
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%0 = insertvalue %0 zeroinitializer, i32 12, 0
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%1 = insertvalue %0 %0, i32 24, 1
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%2 = insertvalue %0 %1, i32 48, 2
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%3 = insertvalue %0 %2, i32 24601, 3
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ret %0 %3
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}
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; CHECK-LABEL: ReturnBigStruct:
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; CHECK: ldc r0, 12
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; CHECK: ldc r1, 24
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; CHECK: ldc r2, 48
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; CHECK: ldc r3, 24601
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; CHECK: retsp 0
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; Structs of more than 4 words are partially returned in memory so long as the
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; function is not variadic.
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define { i32, i32, i32, i32, i32} @f(i32, i32, i32, i32, i32) nounwind readnone {
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; CHECK-LABEL: f:
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; CHECK: ldc [[REGISTER:r[0-9]+]], 5
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; CHECK-NEXT: stw [[REGISTER]], sp[2]
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; CHECK-NEXT: retsp 0
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body:
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ret { i32, i32, i32, i32, i32} { i32 undef, i32 undef, i32 undef, i32 undef, i32 5}
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}
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@x = external global i32
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@y = external global i32
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; Check we call a function returning more than 4 words correctly.
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define i32 @g() nounwind {
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; CHECK-LABEL: g:
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; CHECK: entsp 3
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; CHECK: ldc [[REGISTER:r[0-9]+]], 0
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; CHECK: stw [[REGISTER]], sp[1]
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; CHECK: bl f
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; CHECK-NEXT: ldw r0, sp[2]
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; CHECK-NEXT: retsp 3
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;
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body:
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%0 = call { i32, i32, i32, i32, i32 } @f(i32 0, i32 0, i32 0, i32 0, i32 0)
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%1 = extractvalue { i32, i32, i32, i32, i32 } %0, 4
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ret i32 %1
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}
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; Variadic functions return structs bigger than 4 words via a hidden
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; sret-parameter
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define internal %1 @ReturnBigStruct2(i32 %dummy, ...) nounwind readnone {
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entry:
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%0 = insertvalue %1 zeroinitializer, i32 12, 0
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%1 = insertvalue %1 %0, i32 24, 1
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%2 = insertvalue %1 %1, i32 48, 2
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%3 = insertvalue %1 %2, i32 24601, 3
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%4 = insertvalue %1 %3, i32 4321, 4
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ret %1 %4
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}
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; CHECK-LABEL: ReturnBigStruct2:
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; CHECK: ldc r1, 4321
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; CHECK: stw r1, r0[4]
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; CHECK: ldc r1, 24601
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; CHECK: stw r1, r0[3]
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; CHECK: ldc r1, 48
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; CHECK: stw r1, r0[2]
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; CHECK: ldc r1, 24
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; CHECK: stw r1, r0[1]
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; CHECK: ldc r1, 12
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; CHECK: stw r1, r0[0]
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; CHECK: retsp 0
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