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1e3e36d597
Once MULHS was expanded, this exposed an issue where the condition register was thought to be 16-bit. This caused an attempt to copy a 16-bit register to an 8-bit register. Authored by Jake Goulding llvm-svn: 283634
23 lines
659 B
LLVM
23 lines
659 B
LLVM
; RUN: llc < %s -march=avr | FileCheck %s
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define i1 @unsigned_multiplication_did_overflow(i8, i8) unnamed_addr {
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; CHECK-LABEL: unsigned_multiplication_did_overflow:
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entry-block:
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%2 = tail call { i8, i1 } @llvm.umul.with.overflow.i8(i8 %0, i8 %1)
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%3 = extractvalue { i8, i1 } %2, 1
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ret i1 %3
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; Multiply, return if the high byte is zero
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;
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; CHECK: mul r{{[0-9]+}}, r{{[0-9]+}}
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; CHECK: mov [[HIGH:r[0-9]+]], r1
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; CHECK: ldi [[RET:r[0-9]+]], 1
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; CHECK: cpi {{.*}}[[HIGH]], 0
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; CHECK: brne [[LABEL:LBB[_0-9]+]]
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; CHECK: ldi {{.*}}[[RET]], 0
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; CHECK: {{.*}}[[LABEL]]
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; CHECK: ret
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}
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declare { i8, i1 } @llvm.umul.with.overflow.i8(i8, i8)
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