8d1759c404
This bases the CleanupConstantGlobalUsers() implementation around the ConstantFoldLoadFromConst() API. The general approach is that we discover all users while looking through casts, and then constant fold loads and drop stores and memintrinsics. This avoids special cases and limitations in the previous implementation, which is also incompatible with opaque pointers. The result is a bit more powerful than before, because we now use more general load folding logic which can for example look through pointer bitcasts between different sizes. This is where the test changes come from, as we now fold more loads and can thus remove more globals. Differential Revision: https://reviews.llvm.org/D114889
45 lines
1.4 KiB
LLVM
45 lines
1.4 KiB
LLVM
; RUN: opt -passes=globalopt < %s -S | FileCheck %s
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; RUN: opt -passes=globalopt --mtriple=nvptx64 < %s -S | FileCheck %s --check-prefix=GPU
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; RUN: opt -passes=globalopt --mtriple=amdgcn < %s -S | FileCheck %s --check-prefix=GPU
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; REQUIRES: amdgpu-registered-target, nvptx-registered-target
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; Check that we don't try to set a global initializer for non AS(0) globals.
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@g0 = internal global i16 undef
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@g1 = internal addrspace(3) global i16 undef
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@g2 = internal addrspace(1) global i16 undef
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; CHECK-NOT: @g0 =
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; CHECK: internal unnamed_addr addrspace(3) global i16 undef
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; CHECK: internal unnamed_addr addrspace(1) global i16 undef
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; GPU-NOT: @g0 =
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; GPU: internal unnamed_addr addrspace(3) global i16 undef
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; GPU-NOT: @g2 =
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define void @a() {
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store i16 3, i16* @g0, align 8
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store i16 5, i16* addrspacecast (i16 addrspace(3)* @g1 to i16*), align 8
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store i16 7, i16* addrspacecast (i16 addrspace(1)* @g2 to i16*), align 8
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ret void
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}
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define i8 @get0() {
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%bc = bitcast i16* @g0 to i8*
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%gep = getelementptr i8, i8* %bc, i64 1
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%r = load i8, i8* %gep
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ret i8 %r
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}
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define i8 @get1() {
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%ac = addrspacecast i16 addrspace(3)* @g1 to i16*
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%bc = bitcast i16* %ac to i8*
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%gep = getelementptr i8, i8* %bc, i64 1
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%r = load i8, i8* %gep
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ret i8 %r
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}
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define i8 @get2() {
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%ac = addrspacecast i16 addrspace(1)* @g2 to i16*
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%bc = bitcast i16* %ac to i8*
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%gep = getelementptr i8, i8* %bc, i64 1
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%r = load i8, i8* %gep
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ret i8 %r
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}
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