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6dee31aa07
CopyFromReg nodes for aliasing registers (AX and AL). This confuses the fast register allocator. Instead of CopyFromReg(AL), use ExtractSubReg(CopyFromReg(AX), sub_8bit). This fixes PR7312. llvm-svn: 106934
32 lines
1.4 KiB
LLVM
32 lines
1.4 KiB
LLVM
; RUN: llc -O0 -relocation-model=pic -disable-fp-elim < %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-darwin10"
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; This file contains functions that may crash llc -O0
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; The DIV8 instruction produces results in AH and AL, but we don't want to use
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; AH in 64-bit mode. The hack used must not generate copyFromReg nodes for
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; aliased registers (AX and AL) - RegAllocFast does not like that.
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; PR7312
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define i32 @div8() nounwind {
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entry:
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%0 = trunc i64 undef to i8 ; <i8> [#uses=3]
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%1 = udiv i8 0, %0 ; <i8> [#uses=1]
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%2 = urem i8 0, %0 ; <i8> [#uses=1]
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%3 = icmp uge i8 %2, %0 ; <i1> [#uses=1]
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br i1 %3, label %"40", label %"39"
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"39": ; preds = %"36"
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%4 = zext i8 %1 to i32 ; <i32> [#uses=1]
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%5 = mul nsw i32 %4, undef ; <i32> [#uses=1]
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%6 = add nsw i32 %5, undef ; <i32> [#uses=1]
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%7 = icmp ne i32 %6, undef ; <i1> [#uses=1]
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br i1 %7, label %"40", label %"41"
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"40": ; preds = %"39", %"36"
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unreachable
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"41": ; preds = %"39"
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unreachable
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}
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