derek.holloway
7502bf64a4
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40 lines
1.4 KiB
LLVM
40 lines
1.4 KiB
LLVM
; RUN: opt -S -passes=gvn -enable-load-pre < %s | FileCheck %s
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;
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; The partially redundant load in bb1 should be hoisted to "bb". This comes
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; from this C code (GCC PR 23455):
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; unsigned outcnt; extern void flush_outbuf(void);
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; void bi_windup(unsigned char *outbuf, unsigned char bi_buf) {
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; outbuf[outcnt] = bi_buf;
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; if (outcnt == 16384)
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; flush_outbuf();
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; outbuf[outcnt] = bi_buf;
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; }
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@outcnt = common global i32 0 ; <ptr> [#uses=3]
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define void @bi_windup(ptr %outbuf, i8 zeroext %bi_buf) nounwind {
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entry:
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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%0 = load i32, ptr @outcnt, align 4 ; <i32> [#uses=1]
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%1 = getelementptr i8, ptr %outbuf, i32 %0 ; <ptr> [#uses=1]
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store i8 %bi_buf, ptr %1, align 1
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%2 = load i32, ptr @outcnt, align 4 ; <i32> [#uses=1]
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%3 = icmp eq i32 %2, 16384 ; <i1> [#uses=1]
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br i1 %3, label %bb, label %bb1
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bb: ; preds = %entry
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call void @flush_outbuf() nounwind
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br label %bb1
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bb1: ; preds = %bb, %entry
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; CHECK: bb1:
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; CHECK-NEXT: phi
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; CHECK-NEXT: getelementptr
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%4 = load i32, ptr @outcnt, align 4 ; <i32> [#uses=1]
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%5 = getelementptr i8, ptr %outbuf, i32 %4 ; <ptr> [#uses=1]
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store i8 %bi_buf, ptr %5, align 1
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ret void
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}
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declare void @flush_outbuf()
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