160 lines
5.7 KiB
LLVM
160 lines
5.7 KiB
LLVM
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; RUN: opt -consthoist -mtriple=x86_64-unknown-linux-gnu -consthoist-with-block-frequency=true -S < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; Check when BFI is enabled for constant hoisting, constant 214748364701
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; will not be hoisted to the func entry.
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; CHECK-LABEL: @test1(
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; CHECK: entry:
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; CHECK-NOT: bitcast i64 214748364701 to i64
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; CHECK: if.then:
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; Function Attrs: norecurse nounwind uwtable
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define i64 @test1(i64* nocapture %a) {
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entry:
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%arrayidx = getelementptr inbounds i64, i64* %a, i64 9
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%t0 = load i64, i64* %arrayidx, align 8
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%cmp = icmp slt i64 %t0, 564
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br i1 %cmp, label %if.then, label %if.else5
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if.then: ; preds = %entry
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%arrayidx1 = getelementptr inbounds i64, i64* %a, i64 5
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%t1 = load i64, i64* %arrayidx1, align 8
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%cmp2 = icmp slt i64 %t1, 1009
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br i1 %cmp2, label %if.then3, label %return
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if.then3: ; preds = %if.then
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%arrayidx4 = getelementptr inbounds i64, i64* %a, i64 6
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%t2 = load i64, i64* %arrayidx4, align 8
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%inc = add nsw i64 %t2, 1
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store i64 %inc, i64* %arrayidx4, align 8
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br label %return
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if.else5: ; preds = %entry
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%arrayidx6 = getelementptr inbounds i64, i64* %a, i64 6
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%t3 = load i64, i64* %arrayidx6, align 8
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%cmp7 = icmp slt i64 %t3, 3512
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br i1 %cmp7, label %if.then8, label %return
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if.then8: ; preds = %if.else5
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%arrayidx9 = getelementptr inbounds i64, i64* %a, i64 7
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%t4 = load i64, i64* %arrayidx9, align 8
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%inc10 = add nsw i64 %t4, 1
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store i64 %inc10, i64* %arrayidx9, align 8
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br label %return
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return: ; preds = %if.else5, %if.then, %if.then8, %if.then3
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%retval.0 = phi i64 [ 214748364701, %if.then3 ], [ 214748364701, %if.then8 ], [ 250148364702, %if.then ], [ 256148364704, %if.else5 ]
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ret i64 %retval.0
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}
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; Check when BFI is enabled for constant hoisting, constant 214748364701
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; in while.body will be hoisted to while.body.preheader. 214748364701 in
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; if.then16 and if.else10 will be merged and hoisted to the beginning of
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; if.else10 because if.else10 dominates if.then16.
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; CHECK-LABEL: @test2(
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; CHECK: entry:
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; CHECK-NOT: bitcast i64 214748364701 to i64
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; CHECK: while.body.preheader:
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; CHECK-NEXT: bitcast i64 214748364701 to i64
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; CHECK-NOT: bitcast i64 214748364701 to i64
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; CHECK: if.else10:
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; CHECK-NEXT: bitcast i64 214748364701 to i64
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; CHECK-NOT: bitcast i64 214748364701 to i64
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define i64 @test2(i64* nocapture %a) {
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entry:
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%arrayidx = getelementptr inbounds i64, i64* %a, i64 9
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%t0 = load i64, i64* %arrayidx, align 8
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%cmp = icmp ult i64 %t0, 56
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br i1 %cmp, label %if.then, label %if.else10, !prof !0
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if.then: ; preds = %entry
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%arrayidx1 = getelementptr inbounds i64, i64* %a, i64 5
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%t1 = load i64, i64* %arrayidx1, align 8
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%cmp2 = icmp ult i64 %t1, 10
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br i1 %cmp2, label %while.cond.preheader, label %return, !prof !0
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while.cond.preheader: ; preds = %if.then
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%arrayidx7 = getelementptr inbounds i64, i64* %a, i64 6
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%t2 = load i64, i64* %arrayidx7, align 8
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%cmp823 = icmp ugt i64 %t2, 10000
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br i1 %cmp823, label %while.body.preheader, label %return
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while.body.preheader: ; preds = %while.cond.preheader
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br label %while.body
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while.body: ; preds = %while.body.preheader, %while.body
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%t3 = phi i64 [ %add, %while.body ], [ %t2, %while.body.preheader ]
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%add = add i64 %t3, 214748364701
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%cmp8 = icmp ugt i64 %add, 10000
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br i1 %cmp8, label %while.body, label %while.cond.return.loopexit_crit_edge
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if.else10: ; preds = %entry
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%arrayidx11 = getelementptr inbounds i64, i64* %a, i64 6
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%t4 = load i64, i64* %arrayidx11, align 8
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%add2 = add i64 %t4, 214748364701
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%cmp12 = icmp ult i64 %add2, 35
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br i1 %cmp12, label %if.then16, label %return, !prof !0
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if.then16: ; preds = %if.else10
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%arrayidx17 = getelementptr inbounds i64, i64* %a, i64 7
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%t5 = load i64, i64* %arrayidx17, align 8
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%inc = add i64 %t5, 1
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store i64 %inc, i64* %arrayidx17, align 8
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br label %return
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while.cond.return.loopexit_crit_edge: ; preds = %while.body
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store i64 %add, i64* %arrayidx7, align 8
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br label %return
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return: ; preds = %while.cond.preheader, %while.cond.return.loopexit_crit_edge, %if.else10, %if.then, %if.then16
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%retval.0 = phi i64 [ 214748364701, %if.then16 ], [ 0, %if.then ], [ 0, %if.else10 ], [ 0, %while.cond.return.loopexit_crit_edge ], [ 0, %while.cond.preheader ]
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ret i64 %retval.0
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}
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!0 = !{!"branch_weights", i32 1, i32 2000}
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; 214748364701 will be hoisted to entry block to reduce code size.
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; CHECK-LABEL: @test3(
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; CHECK: entry:
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; CHECK-NEXT: %const = bitcast i64 214748364701 to i64
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define i64 @test3(i64 %t0) {
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entry:
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%cmp = icmp ult i64 %t0, 56
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br i1 %cmp, label %if.then, label %if.else
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; CHECK: if.then:
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; CHECK-NOT: %const = bitcast i64 214748364701 to i64
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if.then:
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%add1 = add i64 %t0, 214748364701
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br label %return
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; CHECK: if.else:
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; CHECK-NOT: %const = bitcast i64 214748364701 to i64
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if.else:
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%add2 = add i64 %t0, 214748364701
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br label %return
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return:
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%retval = phi i64 [ %add1, %if.then ], [ %add2, %if.else ]
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ret i64 %retval
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}
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; 214748364701 will not be hoisted to entry block because it will only
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; increase its live range.
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; CHECK-LABEL: @test4(
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; CHECK: nextblock:
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; CHECK-NEXT: %add1 = add i64 %t0, 214748364701
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define i64 @test4(i64 %t0) {
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entry:
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%cmp = icmp ult i64 %t0, 56
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br label %nextblock
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nextblock:
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%add1 = add i64 %t0, 214748364701
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br label %return
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return:
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ret i64 %add1
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}
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