5650688e72
When expanding a MOVW (16-bit copy) to two MOVs (8-bit copy), the lower byte always comes first. This is incorrect for corner cases like '$r24r23 -> $r25r24', in which the higher byte copy should come first. Current patch fixes that bug as recorded at https://github.com/rust-lang/rust/issues/98167 Reviewed By: benshi001 Differential Revision: https://reviews.llvm.org/D128588
23 lines
575 B
LLVM
23 lines
575 B
LLVM
; RUN: llc < %s -march=avr | FileCheck %s
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; The bug can be found here:
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; https://github.com/rust-lang/rust/issues/98167
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;
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; In this test, `extractvalue` + `call` generate a copy with overlapping
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; registers (`$r25r24 = COPY $r24r23`) that used to be expanded incorrectly.
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define void @main() {
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; CHECK-LABEL: main:
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; CHECK: rcall foo
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; CHECK-NEXT: mov r25, r24
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; CHECK-NEXT: mov r24, r23
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; CHECK-NEXT: rcall bar
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%1 = call { i8, i16 } @foo()
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%2 = extractvalue { i8, i16 } %1, 1
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call void @bar(i16 %2)
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ret void
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}
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declare { i8, i16 } @foo()
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declare void @bar(i16 %0)
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