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a1bb2064f1
This patches teaches EarlyCSE to figure out that if `and i1 %x, %y` is true then both `%x` and `%y` are true in the taken branch, and if `or i1 %x, %y` is false then both `%x` and `%y` are false in non-taken branch. Fix for PR37635. Differential Revision: https://reviews.llvm.org/D47574 Reviewed By: reames llvm-svn: 334707
145 lines
4.1 KiB
LLVM
145 lines
4.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -early-cse -S < %s | FileCheck %s
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; RUN: opt -basicaa -early-cse-memssa -S < %s | FileCheck %s
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define i32 @test_01(i32 %a, i32 %b) {
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; CHECK-LABEL: @test_01(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[COND:%.*]] = icmp slt i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: br i1 [[COND]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
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; CHECK: if.true:
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; CHECK-NEXT: ret i32 [[A]]
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; CHECK: if.false:
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; CHECK-NEXT: ret i32 [[B]]
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;
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entry:
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%cond = icmp slt i32 %a, %b
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br i1 %cond, label %if.true, label %if.false
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if.true:
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%cond2 = icmp slt i32 %a, %b
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%x = select i1 %cond2, i32 %a, i32 %b
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ret i32 %x
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if.false:
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%cond3 = icmp slt i32 %a, %b
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%y = select i1 %cond3, i32 %a, i32 %b
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ret i32 %y
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}
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define i32 @test_02(i32 %a, i32 %b, i1 %c) {
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; CHECK-LABEL: @test_02(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[COND:%.*]] = icmp slt i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[AND_COND:%.*]] = and i1 [[COND]], [[C:%.*]]
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; CHECK-NEXT: br i1 [[AND_COND]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
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; CHECK: if.true:
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; CHECK-NEXT: ret i32 [[A]]
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; CHECK: if.false:
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; CHECK-NEXT: [[Y:%.*]] = select i1 [[COND]], i32 [[A]], i32 [[B]]
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; CHECK-NEXT: ret i32 [[Y]]
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;
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entry:
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%cond = icmp slt i32 %a, %b
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%and.cond = and i1 %cond, %c
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br i1 %and.cond, label %if.true, label %if.false
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if.true:
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%cond2 = icmp slt i32 %a, %b
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%x = select i1 %cond2, i32 %a, i32 %b
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ret i32 %x
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if.false:
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%cond3 = icmp slt i32 %a, %b
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%y = select i1 %cond3, i32 %a, i32 %b
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ret i32 %y
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}
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define i32 @test_03(i32 %a, i32 %b, i1 %c) {
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; CHECK-LABEL: @test_03(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[COND:%.*]] = icmp slt i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[OR_COND:%.*]] = or i1 [[COND]], [[C:%.*]]
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; CHECK-NEXT: br i1 [[OR_COND]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
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; CHECK: if.true:
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; CHECK-NEXT: [[X:%.*]] = select i1 [[COND]], i32 [[A]], i32 [[B]]
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; CHECK-NEXT: ret i32 [[X]]
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; CHECK: if.false:
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; CHECK-NEXT: ret i32 [[B]]
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;
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entry:
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%cond = icmp slt i32 %a, %b
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%or.cond = or i1 %cond, %c
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br i1 %or.cond, label %if.true, label %if.false
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if.true:
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%cond2 = icmp slt i32 %a, %b
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%x = select i1 %cond2, i32 %a, i32 %b
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ret i32 %x
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if.false:
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%cond3 = icmp slt i32 %a, %b
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%y = select i1 %cond3, i32 %a, i32 %b
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ret i32 %y
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}
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define i32 @test_04(i32 %a, i32 %b, i1 %c1, i1 %c2) {
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; CHECK-LABEL: @test_04(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[COND:%.*]] = icmp slt i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[AND_COND1:%.*]] = and i1 [[COND]], [[C1:%.*]]
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; CHECK-NEXT: [[AND_COND2:%.*]] = and i1 [[AND_COND1]], [[C2:%.*]]
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; CHECK-NEXT: br i1 [[AND_COND2]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
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; CHECK: if.true:
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; CHECK-NEXT: ret i32 [[A]]
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; CHECK: if.false:
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; CHECK-NEXT: [[Y:%.*]] = select i1 [[COND]], i32 [[A]], i32 [[B]]
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; CHECK-NEXT: ret i32 [[Y]]
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;
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entry:
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%cond = icmp slt i32 %a, %b
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%and.cond1 = and i1 %cond, %c1
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%and.cond2 = and i1 %and.cond1, %c2
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br i1 %and.cond2, label %if.true, label %if.false
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if.true:
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%cond2 = icmp slt i32 %a, %b
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%x = select i1 %cond2, i32 %a, i32 %b
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ret i32 %x
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if.false:
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%cond3 = icmp slt i32 %a, %b
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%y = select i1 %cond3, i32 %a, i32 %b
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ret i32 %y
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}
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define i32 @test_05(i32 %a, i32 %b, i1 %c1, i1 %c2) {
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; CHECK-LABEL: @test_05(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[COND:%.*]] = icmp slt i32 [[A:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[OR_COND1:%.*]] = or i1 [[COND]], [[C1:%.*]]
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; CHECK-NEXT: [[OR_COND2:%.*]] = or i1 [[OR_COND1]], [[C2:%.*]]
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; CHECK-NEXT: br i1 [[OR_COND2]], label [[IF_TRUE:%.*]], label [[IF_FALSE:%.*]]
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; CHECK: if.true:
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; CHECK-NEXT: [[X:%.*]] = select i1 [[COND]], i32 [[A]], i32 [[B]]
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; CHECK-NEXT: ret i32 [[X]]
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; CHECK: if.false:
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; CHECK-NEXT: ret i32 [[B]]
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;
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entry:
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%cond = icmp slt i32 %a, %b
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%or.cond1 = or i1 %cond, %c1
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%or.cond2 = or i1 %or.cond1, %c2
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br i1 %or.cond2, label %if.true, label %if.false
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if.true:
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%cond2 = icmp slt i32 %a, %b
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%x = select i1 %cond2, i32 %a, i32 %b
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ret i32 %x
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if.false:
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%cond3 = icmp slt i32 %a, %b
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%y = select i1 %cond3, i32 %a, i32 %b
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ret i32 %y
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}
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