4e2364a285
An emergency spill slot is created when the stack size cannot be represented by an 11-bit signed number. This patch also modifies how the `sp` is adjusted in the prologue. `RegScavenger` will place the spill instruction before the prologue if a VReg is created in the prologue. This will pollute the caller's stack data. Therefore, until there is better way, we just use the `addi.w/d` instruction for stack adjustment to ensure that VReg will not be created. (RISCV has the same issue #58286) Due to the addition of emergency spill slot, some test cases that use exact stacksize need to be updated. Differential Revision: https://reviews.llvm.org/D135757
47 lines
1.6 KiB
LLVM
47 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc --mtriple=loongarch64 --verify-machineinstrs < %s \
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; RUN: | FileCheck %s
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;; The stack size is 2048 and the SP adjustment will be split.
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define i32 @SplitSP() nounwind {
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; CHECK-LABEL: SplitSP:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: addi.d $sp, $sp, -2032
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; CHECK-NEXT: st.d $ra, $sp, 2024 # 8-byte Folded Spill
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; CHECK-NEXT: addi.d $sp, $sp, -16
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; CHECK-NEXT: addi.d $a0, $sp, 12
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; CHECK-NEXT: bl %plt(foo)
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; CHECK-NEXT: move $a0, $zero
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; CHECK-NEXT: addi.d $sp, $sp, 16
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; CHECK-NEXT: ld.d $ra, $sp, 2024 # 8-byte Folded Reload
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; CHECK-NEXT: addi.d $sp, $sp, 2032
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; CHECK-NEXT: ret
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entry:
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%xx = alloca [2028 x i8], align 1
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%0 = getelementptr inbounds [2028 x i8], ptr %xx, i32 0, i32 0
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%call = call i32 @foo(ptr nonnull %0)
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ret i32 0
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}
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;; The stack size is 2032 and the SP adjustment will not be split.
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;; 2016 + 8(RA) + 8(emergency spill slot) = 2032
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define i32 @NoSplitSP() nounwind {
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; CHECK-LABEL: NoSplitSP:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: addi.d $sp, $sp, -2032
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; CHECK-NEXT: st.d $ra, $sp, 2024 # 8-byte Folded Spill
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; CHECK-NEXT: addi.d $a0, $sp, 8
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; CHECK-NEXT: bl %plt(foo)
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; CHECK-NEXT: move $a0, $zero
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; CHECK-NEXT: ld.d $ra, $sp, 2024 # 8-byte Folded Reload
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; CHECK-NEXT: addi.d $sp, $sp, 2032
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; CHECK-NEXT: ret
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entry:
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%xx = alloca [2016 x i8], align 1
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%0 = getelementptr inbounds [2024 x i8], ptr %xx, i32 0, i32 0
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%call = call i32 @foo(ptr nonnull %0)
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ret i32 0
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}
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declare i32 @foo(ptr)
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