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https://github.com/c64scene-ar/llvm-6502.git
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llvm-gcc bootstrap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86478 91177308-0d34-0410-b5e6-96231b3b80d8
225 lines
4.5 KiB
LLVM
225 lines
4.5 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @test1(i32 %A, i1 %b) {
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BB0:
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br i1 %b, label %BB1, label %BB2
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BB1:
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; Combine away one argument PHI nodes
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%B = phi i32 [ %A, %BB0 ]
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ret i32 %B
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BB2:
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ret i32 %A
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; CHECK: @test1
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; CHECK: BB1:
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test2(i32 %A, i1 %b) {
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BB0:
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br i1 %b, label %BB1, label %BB2
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BB1:
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br label %BB2
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BB2:
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; Combine away PHI nodes with same values
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%B = phi i32 [ %A, %BB0 ], [ %A, %BB1 ]
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ret i32 %B
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; CHECK: @test2
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; CHECK: BB2:
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test3(i32 %A, i1 %b) {
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BB0:
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br label %Loop
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Loop:
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; PHI has same value always.
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%B = phi i32 [ %A, %BB0 ], [ %B, %Loop ]
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br i1 %b, label %Loop, label %Exit
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Exit:
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ret i32 %B
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; CHECK: @test3
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; CHECK: Exit:
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test4(i1 %b) {
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BB0:
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; Loop is unreachable
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ret i32 7
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Loop: ; preds = %L2, %Loop
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; PHI has same value always.
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%B = phi i32 [ %B, %L2 ], [ %B, %Loop ]
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br i1 %b, label %L2, label %Loop
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L2: ; preds = %Loop
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br label %Loop
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; CHECK: @test4
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; CHECK: Loop:
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; CHECK-NEXT: br i1 %b
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}
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define i32 @test5(i32 %A, i1 %b) {
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BB0:
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br label %Loop
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Loop: ; preds = %Loop, %BB0
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; PHI has same value always.
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%B = phi i32 [ %A, %BB0 ], [ undef, %Loop ]
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br i1 %b, label %Loop, label %Exit
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Exit: ; preds = %Loop
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ret i32 %B
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; CHECK: @test5
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; CHECK: Loop:
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; CHECK-NEXT: br i1 %b
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; CHECK: Exit:
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; CHECK-NEXT: ret i32 %A
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}
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define i32 @test6(i16 %A, i1 %b) {
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BB0:
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%X = zext i16 %A to i32
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br i1 %b, label %BB1, label %BB2
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BB1:
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%Y = zext i16 %A to i32
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br label %BB2
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BB2:
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;; Suck casts into phi
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%B = phi i32 [ %X, %BB0 ], [ %Y, %BB1 ]
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ret i32 %B
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; CHECK: @test6
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; CHECK: BB2:
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; CHECK: zext i16 %A to i32
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; CHECK-NEXT: ret i32
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}
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define i32 @test7(i32 %A, i1 %b) {
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BB0:
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br label %Loop
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Loop: ; preds = %Loop, %BB0
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; PHI is dead.
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%B = phi i32 [ %A, %BB0 ], [ %C, %Loop ]
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%C = add i32 %B, 123
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br i1 %b, label %Loop, label %Exit
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Exit: ; preds = %Loop
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ret i32 0
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; CHECK: @test7
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; CHECK: Loop:
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; CHECK-NEXT: br i1 %b
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}
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define i32* @test8({ i32, i32 } *%A, i1 %b) {
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BB0:
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%X = getelementptr { i32, i32 } *%A, i32 0, i32 1
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br i1 %b, label %BB1, label %BB2
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BB1:
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%Y = getelementptr { i32, i32 } *%A, i32 0, i32 1
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br label %BB2
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BB2:
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;; Suck GEPs into phi
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%B = phi i32* [ %X, %BB0 ], [ %Y, %BB1 ]
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ret i32* %B
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; CHECK: @test8
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; CHECK-NOT: phi
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; CHECK: BB2:
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; CHECK-NEXT: %B = getelementptr
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; CHECK-NEXT: ret i32* %B
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}
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define i32 @test9(i32* %A, i32* %B) {
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entry:
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%c = icmp eq i32* %A, null
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br i1 %c, label %bb1, label %bb
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bb:
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%C = load i32* %B, align 1
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br label %bb2
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bb1:
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%D = load i32* %A, align 1
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br label %bb2
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bb2:
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%E = phi i32 [ %C, %bb ], [ %D, %bb1 ]
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ret i32 %E
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; CHECK: @test9
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; CHECK: bb2:
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; CHECK-NEXT: phi i32* [ %B, %bb ], [ %A, %bb1 ]
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; CHECK-NEXT: %E = load i32* %{{[^,]*}}, align 1
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; CHECK-NEXT: ret i32 %E
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}
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define i32 @test10(i32* %A, i32* %B) {
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entry:
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%c = icmp eq i32* %A, null
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br i1 %c, label %bb1, label %bb
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bb:
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%C = load i32* %B, align 16
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br label %bb2
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bb1:
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%D = load i32* %A, align 32
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br label %bb2
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bb2:
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%E = phi i32 [ %C, %bb ], [ %D, %bb1 ]
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ret i32 %E
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; CHECK: @test10
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; CHECK: bb2:
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; CHECK-NEXT: phi i32* [ %B, %bb ], [ %A, %bb1 ]
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; CHECK-NEXT: %E = load i32* %{{[^,]*}}, align 16
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; CHECK-NEXT: ret i32 %E
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}
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; PR1777
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declare i1 @test11a()
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define i1 @test11() {
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entry:
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%a = alloca i32
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%i = ptrtoint i32* %a to i32
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%b = call i1 @test11a()
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br i1 %b, label %one, label %two
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one:
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%x = phi i32 [%i, %entry], [%y, %two]
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%c = call i1 @test11a()
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br i1 %c, label %two, label %end
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two:
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%y = phi i32 [%i, %entry], [%x, %one]
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%d = call i1 @test11a()
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br i1 %d, label %one, label %end
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end:
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%f = phi i32 [ %x, %one], [%y, %two]
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; Change the %f to %i, and the optimizer suddenly becomes a lot smarter
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; even though %f must equal %i at this point
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%g = inttoptr i32 %f to i32*
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store i32 10, i32* %g
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%z = call i1 @test11a()
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ret i1 %z
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; CHECK: @test11
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; CHECK-NOT: phi i32
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; CHECK: ret i1 %z
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}
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