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3d26dcef22
At some point, ARM stopped getting any benefit from ConstantHoisting because
the pass called a different variant of getIntImmCost. Reimplementing the
correct variant revealed some problems, however:
+ ConstantHoisting was modifying switch statements. This is simply invalid,
the cases must remain integer constants no matter the notional cost.
+ ConstantHoisting was mangling alloca instructions in the entry block. These
should be handled by FrameLowering, so constants actually have a cost of 0.
Worse, the resulting bitcasts meant they became dynamic allocas.
rdar://25707382
llvm-svn: 266260
65 lines
2.4 KiB
LLVM
65 lines
2.4 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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; This test really wants to check that the resultant "cond_true" block only
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; has a single store in it, and that cond_true55 only has code to materialize
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; the constant and do a store. We do *not* want something like this:
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;
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;LBB1_3: @cond_true
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; add r8, r0, r6
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; str r10, [r8, #+4]
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;
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; CHECK: ldr [[R6:r[0-9*]+]], LCP
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; CHECK: cmp {{.*}}, [[R6]]
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; CHECK-NOT: lt
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; CHECK: strlt
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target triple = "arm-apple-darwin8"
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define void @foo(i32* %mc, i32* %mpp, i32* %ip, i32* %dpp, i32* %tpmm, i32 %M, i32* %tpim, i32* %tpdm, i32* %bp, i32* %ms, i32 %xmb) {
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entry:
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%tmp6584 = icmp slt i32 %M, 1 ; <i1> [#uses=1]
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br i1 %tmp6584, label %return, label %bb
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bb: ; preds = %cond_next59, %entry
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%indvar = phi i32 [ 0, %entry ], [ %k.069.0, %cond_next59 ] ; <i32> [#uses=6]
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%k.069.0 = add i32 %indvar, 1 ; <i32> [#uses=3]
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%tmp3 = getelementptr i32, i32* %mpp, i32 %indvar ; <i32*> [#uses=1]
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%tmp4 = load i32, i32* %tmp3 ; <i32> [#uses=1]
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%tmp8 = getelementptr i32, i32* %tpmm, i32 %indvar ; <i32*> [#uses=1]
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%tmp9 = load i32, i32* %tmp8 ; <i32> [#uses=1]
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%tmp10 = add i32 %tmp9, %tmp4 ; <i32> [#uses=2]
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%tmp13 = getelementptr i32, i32* %mc, i32 %k.069.0 ; <i32*> [#uses=5]
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store i32 %tmp10, i32* %tmp13
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%tmp17 = getelementptr i32, i32* %ip, i32 %indvar ; <i32*> [#uses=1]
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%tmp18 = load i32, i32* %tmp17 ; <i32> [#uses=1]
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%tmp22 = getelementptr i32, i32* %tpim, i32 %indvar ; <i32*> [#uses=1]
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%tmp23 = load i32, i32* %tmp22 ; <i32> [#uses=1]
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%tmp24 = add i32 %tmp23, %tmp18 ; <i32> [#uses=2]
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%tmp30 = icmp sgt i32 %tmp24, %tmp10 ; <i1> [#uses=1]
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br i1 %tmp30, label %cond_true, label %cond_next
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cond_true: ; preds = %bb
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store i32 %tmp24, i32* %tmp13
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br label %cond_next
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cond_next: ; preds = %cond_true, %bb
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%tmp39 = load i32, i32* %tmp13 ; <i32> [#uses=1]
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%tmp42 = getelementptr i32, i32* %ms, i32 %k.069.0 ; <i32*> [#uses=1]
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%tmp43 = load i32, i32* %tmp42 ; <i32> [#uses=1]
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%tmp44 = add i32 %tmp43, %tmp39 ; <i32> [#uses=2]
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store i32 %tmp44, i32* %tmp13
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%tmp52 = icmp slt i32 %tmp44, -987654321 ; <i1> [#uses=1]
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br i1 %tmp52, label %cond_true55, label %cond_next59
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cond_true55: ; preds = %cond_next
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store i32 -987654321, i32* %tmp13
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br label %cond_next59
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cond_next59: ; preds = %cond_true55, %cond_next
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%tmp61 = add i32 %indvar, 2 ; <i32> [#uses=1]
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%tmp65 = icmp sgt i32 %tmp61, %M ; <i1> [#uses=1]
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br i1 %tmp65, label %return, label %bb
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return: ; preds = %cond_next59, %entry
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ret void
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}
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