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628c0b289f
Without this patch, GVN-hoist would think that a branch instruction is a scalar instruction
and would try to value number it. The patch filters out all such kind of irrelevant instructions.
A bit frustrating is that there is no easy way to discard all those very infrequent instructions,
a bit like isa<TerminatorInst> that stands for a large family of instructions. I'm thinking that
checking for those very infrequent other instructions would cost us more in compilation time
than just letting those instructions getting numbered, so I'm still thinking that a simpler check:
if (isa<TerminatorInst>(I))
return false;
is better than listing all the other less frequent instructions.
Differential Revision: https://reviews.llvm.org/D23929
llvm-svn: 282160
104 lines
3.5 KiB
LLVM
104 lines
3.5 KiB
LLVM
; RUN: opt -gvn-hoist -S < %s | FileCheck %s
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; Check that recursive GEPs are hoisted.
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; CHECK-LABEL: @fun
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; CHECK: fdiv
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; CHECK: load
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; CHECK: load
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; CHECK: load
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; CHECK: load
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; CHECK: fsub
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; CHECK: fsub
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; CHECK: fmul
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; CHECK: fmul
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; CHECK-NOT: fsub
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; CHECK-NOT: fmul
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%0 = type { double, double, double }
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%1 = type { double, double, double }
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%2 = type { %3, %1, %1 }
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%3 = type { i32 (...)**, %4, %10*, %11, %11, %11, %11, %11, %11, %11, %11, %11 }
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%4 = type { %5 }
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%5 = type { %6 }
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%6 = type { %7 }
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%7 = type { %8 }
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%8 = type { %9 }
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%9 = type { i64, i64, i8* }
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%10 = type <{ i32 (...)**, i32, [4 x i8] }>
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%11 = type { [4 x [4 x double]] }
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%12 = type <{ %1, %0, i32, [4 x i8] }>
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%13 = type { %1, %0, %12, %3*, %14* }
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%14 = type opaque
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@d = external global %0, align 8
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@p = external global %1, align 8
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define zeroext i1 @fun(%2*, %12* dereferenceable(56), double*, %13*) {
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%5 = alloca %2*, align 8
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%6 = alloca %12*, align 8
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%7 = alloca double*, align 8
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%8 = alloca %13*, align 8
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%9 = alloca double, align 8
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%10 = alloca double, align 8
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%11 = alloca double, align 8
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%12 = alloca double, align 8
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%13 = alloca double, align 8
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%14 = alloca double, align 8
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%15 = alloca double, align 8
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store %2* %0, %2** %5, align 8
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store %12* %1, %12** %6, align 8
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store double* %2, double** %7, align 8
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store %13* %3, %13** %8, align 8
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%16 = load %2*, %2** %5, align 8
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%17 = load double, double* getelementptr inbounds (%0, %0* @d, i32 0, i32 0), align 8
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%18 = fdiv double 1.000000e+00, %17
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store double %18, double* %15, align 8
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%19 = load double, double* %15, align 8
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%20 = fcmp oge double %19, 0.000000e+00
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br i1 %20, label %21, label %36
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; <label>:21: ; preds = %4
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%22 = getelementptr inbounds %2, %2* %16, i32 0, i32 1
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%23 = getelementptr inbounds %1, %1* %22, i32 0, i32 0
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%24 = load double, double* %23, align 8
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%25 = load double, double* getelementptr inbounds (%1, %1* @p, i32 0, i32 0), align 8
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%26 = fsub double %24, %25
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%27 = load double, double* %15, align 8
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%28 = fmul double %26, %27
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store double %28, double* %9, align 8
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%29 = getelementptr inbounds %2, %2* %16, i32 0, i32 2
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%30 = getelementptr inbounds %1, %1* %29, i32 0, i32 0
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%31 = load double, double* %30, align 8
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%32 = load double, double* getelementptr inbounds (%1, %1* @p, i32 0, i32 0), align 8
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%33 = fsub double %31, %32
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%34 = load double, double* %15, align 8
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%35 = fmul double %33, %34
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store double %35, double* %12, align 8
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br label %51
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; <label>:36: ; preds = %4
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%37 = getelementptr inbounds %2, %2* %16, i32 0, i32 2
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%38 = getelementptr inbounds %1, %1* %37, i32 0, i32 0
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%39 = load double, double* %38, align 8
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%40 = load double, double* getelementptr inbounds (%1, %1* @p, i32 0, i32 0), align 8
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%41 = fsub double %39, %40
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%42 = load double, double* %15, align 8
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%43 = fmul double %41, %42
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store double %43, double* %9, align 8
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%44 = getelementptr inbounds %2, %2* %16, i32 0, i32 1
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%45 = getelementptr inbounds %1, %1* %44, i32 0, i32 0
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%46 = load double, double* %45, align 8
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%47 = load double, double* getelementptr inbounds (%1, %1* @p, i32 0, i32 0), align 8
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%48 = fsub double %46, %47
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%49 = load double, double* %15, align 8
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%50 = fmul double %48, %49
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store double %50, double* %12, align 8
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br label %51
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; <label>:51: ; preds = %36, %21
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%52 = load double, double* %12, align 8
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%53 = load double, double* %9, align 8
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%54 = fcmp olt double %52, %53
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ret i1 %54
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}
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