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e306a84b0e
For PHIs with multiple incoming values, we can improve precision by using constant ranges for integers. We can over-approximate phis by merging the incoming values. Reviewers: davide, efriedma, mssimpso Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D71933
216 lines
6.5 KiB
LLVM
216 lines
6.5 KiB
LLVM
; RUN: opt < %s -ipsccp -S | FileCheck %s
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define internal i32 @f1(i32 %x) {
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; CHECK-LABEL: define internal i32 @f1(
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; CHECK-NEXT: ret i32 undef
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;
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%cmp = icmp sgt i32 %x, 300
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%res = select i1 %cmp, i32 1, i32 2
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ret i32 %res
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}
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; %res is a constant range [0, 2) from a PHI node.
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define i32 @caller1(i1 %cmp) {
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; CHECK-LABEL: define i32 @caller1(
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; CHECK-LABEL: entry:
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; CHECK-NEXT: br i1 %cmp, label %if.true, label %end
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; CHECK-LABEL: if.true:
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; CHECK-NEXT: br label %end
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; CHECK-LABEL: end:
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; CHECK-NEXT: %res = phi i32 [ 0, %entry ], [ 1, %if.true ]
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; CHECK-NEXT: %call1 = tail call i32 @f1(i32 %res)
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; CHECK-NEXT: ret i32 2
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;
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entry:
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br i1 %cmp, label %if.true, label %end
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if.true:
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br label %end
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end:
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%res = phi i32 [ 0, %entry], [ 1, %if.true ]
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%call1 = tail call i32 @f1(i32 %res)
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ret i32 %call1
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}
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define internal i32 @f2(i32 %x, i32 %y, i32 %z, i1 %cmp.1, i1 %cmp.2) {
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; CHECK-LABEL: define internal i32 @f2(
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; CHECK-LABEL: entry:
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; CHECK-NEXT: br i1 %cmp.1, label %if.true.1, label %end
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; CHECK-LABEL: if.true.1:
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; CHECK-NEXT: br i1 %cmp.2, label %if.true.2, label %end
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; CHECK-LABEL: if.true.2:
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; CHECK-NEXT: br label %end
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; CHECK-LABEL: end:
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; CHECK-NEXT: %p = phi i32 [ %x, %entry ], [ %y, %if.true.1 ], [ %z, %if.true.2 ]
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; CHECK-NEXT: %c.1 = icmp sgt i32 %p, 5
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; CHECK-NEXT: %c.2 = icmp eq i32 %p, 0
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; CHECK-NEXT: %c.3 = icmp slt i32 %p, 0
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; CHECK-NEXT: %v.1 = select i1 %c.1, i32 10, i32 100
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; CHECK-NEXT: %v.2 = select i1 %c.2, i32 20, i32 200
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; CHECK-NEXT: %v.3 = select i1 %c.3, i32 30, i32 300
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; CHECK-NEXT: %r.1 = add i32 %v.1, %v.2
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; CHECK-NEXT: %r.2 = add i32 %r.1, %v.3
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; CHECK-NEXT: %r.3 = add i32 %r.2, 400
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; CHECK-NEXT: %r.4 = add i32 %r.3, 50
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; CHECK-NEXT: %r.5 = add i32 %r.4, 60
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; CHECK-NEXT: %r.6 = add i32 %r.4, 700
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; CHECK-NEXT: ret i32 %r.6
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;
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entry:
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br i1 %cmp.1, label %if.true.1, label %end
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if.true.1:
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br i1 %cmp.2, label %if.true.2, label %end
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if.true.2:
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br label %end
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end:
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%p = phi i32 [ %x, %entry ], [ %y, %if.true.1 ], [ %z, %if.true.2 ]
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%c.1 = icmp sgt i32 %p, 5
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%c.2 = icmp eq i32 %p, 0
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%c.3 = icmp slt i32 %p, 0
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%c.4 = icmp sgt i32 %p, 10
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%c.5 = icmp sle i32 %p, 10
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%c.6 = icmp sgt i32 %p, -11
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%c.7 = icmp slt i32 %p, -11
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%v.1 = select i1 %c.1, i32 10, i32 100
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%v.2 = select i1 %c.2, i32 20, i32 200
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%v.3 = select i1 %c.3, i32 30, i32 300
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%v.4 = select i1 %c.4, i32 40, i32 400
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%v.5 = select i1 %c.5, i32 50, i32 500
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%v.6 = select i1 %c.6, i32 60, i32 600
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%v.7 = select i1 %c.7, i32 70, i32 700
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%r.1 = add i32 %v.1, %v.2
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%r.2 = add i32 %r.1, %v.3
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%r.3 = add i32 %r.2, %v.4
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%r.4 = add i32 %r.3, %v.5
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%r.5 = add i32 %r.4, %v.6
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%r.6 = add i32 %r.4, %v.7
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ret i32 %r.6
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}
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define i32 @caller2(i1 %cmp.1, i1 %cmp.2) {
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; CHECK-LABEL: define i32 @caller2(i1 %cmp.1, i1 %cmp.2) {
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; CHECK-LABEL: entry:
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; CHECK-NEXT: br i1 %cmp.1, label %if.true, label %end
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; CHECK-LABEL: if.true: ; preds = %entry
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; CHECK-NEXT: br label %end
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; CHECK-LABEL: end: ; preds = %if.true, %entry
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; CHECK-NEXT: %p1 = phi i32 [ 0, %entry ], [ 1, %if.true ]
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; CHECK-NEXT: %p2 = phi i32 [ 1, %entry ], [ -10, %if.true ]
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; CHECK-NEXT: %p3 = phi i32 [ 1, %entry ], [ 10, %if.true ]
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; CHECK-NEXT: %call1 = tail call i32 @f2(i32 %p1, i32 %p2, i32 %p3, i1 %cmp.1, i1 %cmp.2)
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; CHECK-NEXT: ret i32 %call1
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;
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entry:
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br i1 %cmp.1, label %if.true, label %end
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if.true:
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br label %end
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end:
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%p1 = phi i32 [ 0, %entry], [ 1, %if.true ]
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%p2 = phi i32 [ 1, %entry], [ -10, %if.true ]
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%p3 = phi i32 [ 1, %entry], [ 10, %if.true ]
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%call1 = tail call i32 @f2(i32 %p1, i32 %p2, i32 %p3, i1 %cmp.1, i1 %cmp.2)
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ret i32 %call1
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}
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define internal i32 @f3(i32 %x, i32 %y, i1 %cmp.1) {
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; CHECK-LABEL: define internal i32 @f3(i32 %x, i32 %y, i1 %cmp.1) {
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; CHECK-LABEL: entry:
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; CHECK-NEXT: br i1 %cmp.1, label %if.true.1, label %end
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; CHECK-LABEL: if.true.1: ; preds = %entry
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; CHECK-NEXT: br label %end
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; CHECK-LABEL: end: ; preds = %if.true.1, %entry
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; CHECK-NEXT: %p = phi i32 [ %x, %entry ], [ %y, %if.true.1 ]
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; CHECK-NEXT: %c.1 = icmp sgt i32 %p, 5
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; CHECK-NEXT: %c.2 = icmp eq i32 %p, 0
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; CHECK-NEXT: %c.3 = icmp slt i32 %p, 0
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; CHECK-NEXT: %c.4 = icmp sgt i32 %p, 10
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; CHECK-NEXT: %c.5 = icmp sle i32 %p, 10
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; CHECK-NEXT: %c.6 = icmp sgt i32 %p, -11
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; CHECK-NEXT: %c.7 = icmp slt i32 %p, -11
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; CHECK-NEXT: %v.1 = select i1 %c.1, i32 10, i32 100
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; CHECK-NEXT: %v.2 = select i1 %c.2, i32 20, i32 200
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; CHECK-NEXT: %v.3 = select i1 %c.3, i32 30, i32 300
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; CHECK-NEXT: %v.4 = select i1 %c.4, i32 40, i32 400
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; CHECK-NEXT: %v.5 = select i1 %c.5, i32 50, i32 500
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; CHECK-NEXT: %v.6 = select i1 %c.6, i32 60, i32 600
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; CHECK-NEXT: %v.7 = select i1 %c.7, i32 70, i32 700
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; CHECK-NEXT: %r.1 = add i32 %v.1, %v.2
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; CHECK-NEXT: %r.2 = add i32 %r.1, %v.3
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; CHECK-NEXT: %r.3 = add i32 %r.2, %v.4
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; CHECK-NEXT: %r.4 = add i32 %r.3, %v.5
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; CHECK-NEXT: %r.5 = add i32 %r.4, %v.6
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; CHECK-NEXT: %r.6 = add i32 %r.4, %v.7
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; CHECK-NEXT: ret i32 %r.6
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;
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entry:
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br i1 %cmp.1, label %if.true.1, label %end
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if.true.1:
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br label %end
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end:
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%p = phi i32 [ %x, %entry ], [ %y, %if.true.1 ]
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%c.1 = icmp sgt i32 %p, 5
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%c.2 = icmp eq i32 %p, 0
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%c.3 = icmp slt i32 %p, 0
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%c.4 = icmp sgt i32 %p, 10
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%c.5 = icmp sle i32 %p, 10
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%c.6 = icmp sgt i32 %p, -11
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%c.7 = icmp slt i32 %p, -11
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%v.1 = select i1 %c.1, i32 10, i32 100
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%v.2 = select i1 %c.2, i32 20, i32 200
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%v.3 = select i1 %c.3, i32 30, i32 300
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%v.4 = select i1 %c.4, i32 40, i32 400
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%v.5 = select i1 %c.5, i32 50, i32 500
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%v.6 = select i1 %c.6, i32 60, i32 600
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%v.7 = select i1 %c.7, i32 70, i32 700
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%r.1 = add i32 %v.1, %v.2
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%r.2 = add i32 %r.1, %v.3
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%r.3 = add i32 %r.2, %v.4
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%r.4 = add i32 %r.3, %v.5
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%r.5 = add i32 %r.4, %v.6
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%r.6 = add i32 %r.4, %v.7
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ret i32 %r.6
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}
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define i32 @caller3(i32 %y, i1 %cmp.1) {
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; CHECK-LABEL: define i32 @caller3(i32 %y, i1 %cmp.1) {
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; CHECK-LABEL: entry:
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; CHECK-NEXT: br i1 %cmp.1, label %if.true, label %end
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; CHECK-LABEL: if.true:
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; CHECK-NEXT: br label %end
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; CHECK-LABEL: end:
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; CHECK-NEXT: %p1 = phi i32 [ 0, %entry ], [ 5, %if.true ]
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; CHECK-NEXT: %call1 = tail call i32 @f3(i32 %p1, i32 %y, i1 %cmp.1)
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; CHECK-NEXT: ret i32 %call1
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;
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entry:
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br i1 %cmp.1, label %if.true, label %end
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if.true:
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br label %end
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end:
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%p1 = phi i32 [ 0, %entry], [ 5, %if.true ]
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%call1 = tail call i32 @f3(i32 %p1, i32 %y, i1 %cmp.1)
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ret i32 %call1
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}
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