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57 lines
1.8 KiB
LLVM
57 lines
1.8 KiB
LLVM
; RUN: opt -instcombine %s -S | FileCheck %s
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;; This tests that the instructions in the entry blocks are sunk into each
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;; arm of the 'if'.
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define i32 @test1(i1 %C, i32 %A, i32 %B) {
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; CHECK: @test1
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entry:
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%tmp.2 = sdiv i32 %A, %B ; <i32> [#uses=1]
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%tmp.9 = add i32 %B, %A ; <i32> [#uses=1]
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br i1 %C, label %then, label %endif
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then: ; preds = %entry
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ret i32 %tmp.9
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endif: ; preds = %entry
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; CHECK: sdiv i32
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; CHECK-NEXT: ret i32
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ret i32 %tmp.2
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}
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;; PHI use, sink divide before call.
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define i32 @test2(i32 %x) nounwind ssp {
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; CHECK: @test2
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; CHECK-NOT: sdiv i32
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entry:
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br label %bb
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bb: ; preds = %bb2, %entry
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%x_addr.17 = phi i32 [ %x, %entry ], [ %x_addr.0, %bb2 ] ; <i32> [#uses=4]
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%i.06 = phi i32 [ 0, %entry ], [ %4, %bb2 ] ; <i32> [#uses=1]
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%0 = add nsw i32 %x_addr.17, 1 ; <i32> [#uses=1]
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%1 = sdiv i32 %0, %x_addr.17 ; <i32> [#uses=1]
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%2 = icmp eq i32 %x_addr.17, 0 ; <i1> [#uses=1]
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br i1 %2, label %bb1, label %bb2
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bb1: ; preds = %bb
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; CHECK: bb1:
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; CHECK-NEXT: add nsw i32 %x_addr.17, 1
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; CHECK-NEXT: sdiv i32
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; CHECK-NEXT: tail call i32 @bar()
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%3 = tail call i32 @bar() nounwind ; <i32> [#uses=0]
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br label %bb2
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bb2: ; preds = %bb, %bb1
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%x_addr.0 = phi i32 [ %1, %bb1 ], [ %x_addr.17, %bb ] ; <i32> [#uses=2]
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%4 = add nsw i32 %i.06, 1 ; <i32> [#uses=2]
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%exitcond = icmp eq i32 %4, 1000000 ; <i1> [#uses=1]
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br i1 %exitcond, label %bb4, label %bb
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bb4: ; preds = %bb2
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ret i32 %x_addr.0
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}
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declare i32 @bar()
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