derek.holloway
7502bf64a4
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96 lines
3.5 KiB
LLVM
96 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -passes=gvn -S < %s | FileCheck --check-prefixes=CHECK,MDEP %s
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; RUN: opt -passes='gvn<memoryssa>' -S < %s | FileCheck --check-prefixes=CHECK,MSSA %s
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; C source:
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;
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; void f(int x) {
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; if (x != 1)
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; puts (x == 2 ? "a" : "b");
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; for (;;) {
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; puts("step 1");
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; if (x == 2)
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; continue;
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; printf("step 2: %d\n", x);
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; }
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; }
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;
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; If we PRE %cmp3, CodeGenPrepare won't be able to sink the compare down to its
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; uses, and we are forced to keep both %x and %cmp3 in registers in the loop.
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;
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; It is just as cheap to recompute the icmp against %x as it is to compare a
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; GPR against 0. On x86-64, the br i1 %cmp3 becomes:
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;
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; testb %r12b, %r12b
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; jne LBB0_3
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;
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; The sunk icmp is:
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;
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; cmpl $2, %ebx
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; je LBB0_3
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;
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; This is just as good, and it doesn't require a separate register.
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;
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; CHECK-NOT: phi i1
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@.str = private unnamed_addr constant [2 x i8] c"a\00", align 1
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@.str1 = private unnamed_addr constant [2 x i8] c"b\00", align 1
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@.str2 = private unnamed_addr constant [7 x i8] c"step 1\00", align 1
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@.str3 = private unnamed_addr constant [12 x i8] c"step 2: %d\0A\00", align 1
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define void @f(i32 %x) noreturn nounwind uwtable ssp {
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; CHECK-LABEL: define void @f(
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; CHECK-SAME: i32 [[X:%.*]]) #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[X]], 1
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; CHECK-NEXT: br i1 [[CMP]], label %[[FOR_COND_PREHEADER:.*]], label %[[IF_THEN:.*]]
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; CHECK: [[IF_THEN]]:
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; CHECK-NEXT: [[CMP1:%.*]] = icmp eq i32 [[X]], 2
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; CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP1]], ptr @.str, ptr @.str1
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; CHECK-NEXT: [[CALL:%.*]] = tail call i32 @puts(ptr [[COND]]) #[[ATTR1:[0-9]+]]
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; CHECK-NEXT: br label %[[FOR_COND_PREHEADER]]
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; CHECK: [[FOR_COND_PREHEADER]]:
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; CHECK-NEXT: [[CMP3:%.*]] = icmp eq i32 [[X]], 2
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; CHECK-NEXT: br label %[[FOR_COND:.*]]
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; CHECK: [[FOR_COND]]:
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; CHECK-NEXT: [[CALL2:%.*]] = tail call i32 @puts(ptr @.str2) #[[ATTR1]]
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; CHECK-NEXT: br i1 [[CMP3]], label %[[FOR_COND_BACKEDGE:.*]], label %[[IF_END5:.*]]
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; CHECK: [[IF_END5]]:
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; CHECK-NEXT: [[CALL6:%.*]] = tail call i32 (ptr, ...) @printf(ptr @.str3, i32 [[X]]) #[[ATTR1]]
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; CHECK-NEXT: br label %[[FOR_COND_BACKEDGE]]
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; CHECK: [[FOR_COND_BACKEDGE]]:
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; CHECK-NEXT: br label %[[FOR_COND]]
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;
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entry:
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%cmp = icmp eq i32 %x, 1
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br i1 %cmp, label %for.cond.preheader, label %if.then
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if.then: ; preds = %entry
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%cmp1 = icmp eq i32 %x, 2
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%cond = select i1 %cmp1, ptr @.str, ptr @.str1
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%call = tail call i32 @puts(ptr %cond) nounwind
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br label %for.cond.preheader
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for.cond.preheader: ; preds = %entry, %if.then
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%cmp3 = icmp eq i32 %x, 2
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br label %for.cond
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for.cond: ; preds = %for.cond.backedge, %for.cond.preheader
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%call2 = tail call i32 @puts(ptr @.str2) nounwind
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br i1 %cmp3, label %for.cond.backedge, label %if.end5
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if.end5: ; preds = %for.cond
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%call6 = tail call i32 (ptr, ...) @printf(ptr @.str3, i32 %x) nounwind
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br label %for.cond.backedge
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for.cond.backedge: ; preds = %if.end5, %for.cond
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br label %for.cond
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}
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declare i32 @puts(ptr nocapture) nounwind
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declare i32 @printf(ptr nocapture, ...) nounwind
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;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
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; MDEP: {{.*}}
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; MSSA: {{.*}}
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