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commit 2bf5d540eba8c7532ce81d5de36ed25781df6881
Author: Uros Bizja <ubizjak(a)gmail.com>
Date: Mon Jul 13 18:26:05 2015 -0700
Fix PR 58066, __tls_get_addr is called with misaligned stack on x86-64
This is rtl-optimization part of a two-part patch series.
As discussed in the PR, we have to prcompute register parameters
before stack alignment is performed, otherwise eventual call to
__tls_get_addr can be called with unaligned stack. When compiling the
testcase from the PR, anti_adjust_stack is called just before
precompute starts expanding function parameters.
The solution is to move precomputation before stack pointer is adjusted.
PR rtl-optimization/58066
* calls.c (expand_call): Precompute register parameters before stack
alignment is performed.
---
gcc/calls.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/gcc/calls.c b/gcc/calls.c
index 32ea4eb..88d3c4f 100644
--- a/gcc/calls.c
+++ b/gcc/calls.c
@@ -3115,6 +3115,10 @@ expand_call (tree exp, rtx target, int ignore)
compute_argument_addresses (args, argblock, num_actuals);
+ /* Precompute all register parameters. It isn't safe to compute anything
+ once we have started filling any specific hard regs. */
+ precompute_register_parameters (num_actuals, args, ®_parm_seen);
+
/* Perform stack alignment before the first push (the last arg). */
if (argblock == 0
&& adjusted_args_size.constant > reg_parm_stack_space
@@ -3155,10 +3159,6 @@ expand_call (tree exp, rtx target, int ignore)
funexp = rtx_for_function_call (fndecl, addr);
- /* Precompute all register parameters. It isn't safe to compute anything
- once we have started filling any specific hard regs. */
- precompute_register_parameters (num_actuals, args, ®_parm_seen);
-
if (CALL_EXPR_STATIC_CHAIN (exp))
static_chain_value = expand_normal (CALL_EXPR_STATIC_CHAIN (exp));
else
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discards 4e7b637 Patch from Uros
discards b923fb4 Revert "Align stack before calling __tls_get_addr"
discards a357dd2 Align stack before calling __tls_get_addr
adds fb0f0fa Daily bump.
new 2bf5d54 Fix PR 58066, __tls_get_addr is called with misaligned stack [...]
new 091969c Fix PR 58066, __tls_get_addr is called with misaligned stack [...]
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