derek.holloway
7502bf64a4
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48 lines
1.8 KiB
LLVM
48 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
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; RUN: llc < %s -mtriple=riscv64 -mattr=+v | FileCheck %s
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; This showcases a miscompile that was fixed in #90573:
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; - The memset will be type-legalized to a 512 bit store + 2 x 128 bit stores.
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; - the load and store of q aliases the upper 128 bits store of p.
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; - The aliasing 128 bit store will be between the chain of the scalar
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; load/store:
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;
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; t54: ch = store<(store (s512) into %ir.p, align 1)> t0, ...
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; t51: ch = store<(store (s128) into %ir.p + 64, align 1)> t0, ...
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;
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; t44: i64,ch = load<(load (s32) from %ir.q), sext from i32> t0, ...
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; t50: ch = store<(store (s128) into %ir.p + 80, align 1)> t44:1, ...
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; t46: ch = store<(store (s32) into %ir.q), trunc to i32> t50, ...
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;
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; Previously, the scalar load/store was incorrectly combined away:
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;
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; t54: ch = store<(store (s512) into %ir.p, align 1)> t0, ...
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; t51: ch = store<(store (s128) into %ir.p + 64, align 1)> t0, ...
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;
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; // MISSING
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; t50: ch = store<(store (s128) into %ir.p + 80, align 1)> t44:1, ...
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; // MISSING
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; See also pr83017.ll: This is the same code, but relies on vscale_range instead
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; of -riscv-v-vector-bits-max=128.
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define void @f(ptr %p) vscale_range(2,2) {
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; CHECK-LABEL: f:
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; CHECK: # %bb.0:
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; CHECK-NEXT: lw a1, 84(a0)
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; CHECK-NEXT: addi a2, a0, 80
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; CHECK-NEXT: vsetivli zero, 16, e8, m1, ta, ma
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; CHECK-NEXT: vmv.v.i v8, 0
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; CHECK-NEXT: vs1r.v v8, (a2)
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; CHECK-NEXT: addi a2, a0, 64
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; CHECK-NEXT: vs1r.v v8, (a2)
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; CHECK-NEXT: vsetvli a2, zero, e8, m4, ta, ma
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; CHECK-NEXT: vmv.v.i v8, 0
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; CHECK-NEXT: vs4r.v v8, (a0)
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; CHECK-NEXT: sw a1, 84(a0)
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; CHECK-NEXT: ret
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%q = getelementptr inbounds i8, ptr %p, i64 84
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%x = load i32, ptr %q
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call void @llvm.memset.p0.i64(ptr %p, i8 0, i64 96, i1 false)
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store i32 %x, ptr %q
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ret void
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}
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